A 85 kg man lying on a surface of negligible friction shoves a 82 g stone away from himself, giving it a speed of 9.0 m/s. As a result of the shove, the man does not acquire any speed and remains at rest.
To solve this problem, we can use the principle of conservation of momentum.
According to this principle, the total momentum before the shove is equal to the total momentum after the shove.
The momentum of an object is given by the product of its mass and velocity.
Let's denote the initial velocity of the man as v1 and the final velocity of the man as v2.
Before the shove:
The momentum of the man is given by p1 = m1 * v1, where m1 is the mass of the man.
The momentum of the stone is given by p2 = m2 * v2, where m2 is the mass of the stone.
After the shove:
The man and the stone move in opposite directions, so their momenta have opposite signs.
The momentum of the man is given by p3 = -m1 * v2.
The momentum of the stone is given by p4 = -m2 * v2.
According to the conservation of momentum, we have:
p1 + p2 = p3 + p4
Substituting the values:
m1 * v1 + m2 * v2 = -m1 * v2 - m2 * v2
Now we can solve for v2, which represents the final velocity of the man:
v2 = (m1 * v1) / (m1 + m2)
Substituting the given values:
v2 = (85 kg * 0 m/s) / (85 kg + 0.082 kg)
Calculating the final velocity:
v2 = 0 m/s
Therefore, as a result of the shove, the man does not acquire any speed and remains at rest.
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A beam of light travels from air into an unknown liquid. The incident light ray strikes the air-liquid boundary at an angle of 35.3 degrees from the normal and the ray refracts into the liquid at an angle of 21.2 degrees from the normal. a) What is the index of refraction of the unknown liquid? b) If the ray of light started under the surface of the liquid and was directed towards the surface (towards the air-liquid boundary), what would be the critical angle for total internal reflection?
The index of refraction of the unknown liquid is 1.39.
The critical angle for total internal reflection would be 49.4 degrees.
a) Index of refraction of the unknown liquid can be found by using Snell's law which states that: `
n1sinθ1 = n2sinθ2`.
Where,
n1 is the refractive index of the first medium
θ1 is the angle of incidence of the first medium.
n2 is the refractive index of the second medium
θ2 is the angle of refraction of the second medium
n1=1 (since light travels from air) and
θ1=35.3,
n2= ?
θ2=21.2
Substituting these values in Snell's law:
sin 35.3/ n2 = sin 21.2n2 = sin 35.3 / sin 21.2n2 = 1.39
Thus the index of refraction of the unknown liquid is 1.39.
b) The critical angle can be calculated using the formula: `
sin c = 1/n`.
c = critical angle,
n = refractive index of the second medium
Here, the second medium is the unknown liquid and the refractive index is 1.39 (from part a)
Thus, sin c = 1/1.39
c = sin−1(1/1.39) = 49.4 degrees
Therefore, the critical angle for total internal reflection would be 49.4 degrees.
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Light beam will enter water at incident angle of 80°, before it enter a diamond crystal. What will be the speed of light, in x10⁶ m/s, inside the diamond crystal?
(nwater = 1.333, ndiamond = 2.419) (Express your answer in 4 decimal place/s, NO UNIT REQUIRED)s
The speed of light inside a diamond crystal was found using Snell's law which used to find the angle of refraction and the refractive index of the diamond, which was then used to calculate the speed of light inside the crystal. The final answer is approximately 1.2791 x 10⁸ m/s.
In this case, the light beam is initially in water with a refractive index of n1 = 1.333 and an incident angle of θ1 = 80°. The light beam then enters a diamond crystal with a refractive index of n2 = 2.419. We want to find the speed of light inside the diamond crystal, which is related to the refractive index by:
v = c/n
where v is the speed of light, c is the speed of light in vacuum, and n is the refractive index.
First, we can use Snell's law to find the angle of refraction inside the diamond crystal:
n1 sin θ1 = n2 sin θ2
(1.333)sin(80°) = (2.419)sin(θ2)
θ2 = sin⁻¹[(1.333/2.419)sin(80°)]
θ2 ≈ 47.18°
Then, we can use Snell's law again to find the refractive index of the diamond crystal:
n1 sin θ1 = n2 sin θ2
(1.333)sin(80°) = (n2)sin(47.18°)
n2 = (1.333)sin(80°)/sin(47.18°)
n2 ≈ 2.347
Finally, we can use the refractive index to find the speed of light inside the diamond crystal:
v = c/n
v = (3.00 x 10⁸ m/s)/(2.347)
v ≈ 1.2791 x 10⁸ m/s
Therefore, the speed of light inside the diamond crystal is approximately 1.2791 x 10⁸ m/s.
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A river flows from west to east at 2.00 m/s. A person want to row a boat from the south bank to the north bank so that they travel due north across the river. In what direction measured from north must a person point the boat when rowing at 3.47 m/s so the boat goes straight across traveling due north. HINT: think vector components - the boat's x component must be equal and opposite to the river velocity in order that the boat travel due north straight across the river.
The person must point the boat in the direction measured from north at an angle of approximately 59.1 degrees to the west (clockwise direction) so that the boat goes straight across the river traveling due north. To determine the direction in which the person must point the boat, we need to consider the vector components of the boat's velocity and the river's velocity.
Let's define the x-axis as pointing east and the y-axis as pointing north. The river's velocity is given as 2.00 m/s in the positive x-direction (west to east). The person wants the boat to travel due north, which means the boat's velocity in the y-direction should be 3.47 m/s.
To achieve this, the boat's x-component of velocity must be equal and opposite to the river's velocity. In other words, the x-component of the boat's velocity should be -2.00 m/s.
Now, we can use vector components to find the direction in which the person must point the boat. The boat's velocity vector can be represented as the sum of its x-component and y-component:
[tex]V_{boat[/tex] =[tex]V_x[/tex]î +[tex]V_y[/tex]ĵ
Given that [tex]V_x[/tex] = -2.00 m/s and [tex]V_y[/tex] = 3.47 m/s, the boat's velocity vector can be written as:
[tex]V_{boat[/tex]= (-2.00 î) + (3.47 ĵ)
To find the direction of the boat's velocity, we can calculate the angle it makes with the positive y-axis (north). The angle θ is given by:
θ =[tex]tan^(-1)(V_y/V_x)[/tex]
θ = [tex]tan^(-1[/tex])(3.47/-2.00)
Using a calculator, we find θ ≈ -59.1 degrees.
Therefore, the person must point the boat in the direction measured from north at an angle of approximately 59.1 degrees to the west (clockwise direction) so that the boat goes straight across the river traveling due north.
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Part A:
A 2.0-m long wire carries a 5.0-A current due north. If there is a 0.010T magnetic field pointing west, what is the magnitude of the magnetic force on the wire?
Answer: _____ N
Which direction (N-S-E-W-Up-Down) is the force on the wire?
Answer: ____
Part B:
A 100-turn square loop of a wire of 10.0 cm on a side carries a current in a 3.00-T field. What is the current if the maximum torque on this loop is 18.0 Nm?
Answer: _____ A
A 2.0-m long wire carries a 5.0-A current due north and there is a 0.010T magnetic field pointing west
The magnetic force on the wire is given by the formula:
F = BILsinθ Where, F = Magnetic force, B = Magnetic field strength, I = Current, L = Length of the wire, θ = Angle between the direction of the magnetic field and the direction of the current. The magnitude of the magnetic force on the wire is given by the formula:
F = BILsinθ
F = 0.010 T × 5.0 A × 2.0 m × sin 90°
F = 0.1 N
Part A: Thus, the magnitude of the magnetic force on the wire is 0.1 N.
The direction of the magnetic force will be towards the west.
This is given by Fleming's left-hand rule which states that if the forefingers point in the direction of the magnetic field, and the middle fingers in the direction of the current, then the thumb points in the direction of the magnetic force. In this case, the magnetic field is pointing towards the west and the current is towards the north. Thus, the magnetic force will be towards the west.
Part B: Number of turns, N = 100, Length of the side of the square loop, l = 10 cm = 0.1 m, Magnetic field, B = 3.00 T, Maximum torque, τ = 18.0 Nm
The formula to calculate torque is given by the formula: τ = NABsinθ, Where,τ = Torque, N = Number of turns, B = Magnetic field strength, A = Area of the loop, θ = Angle between the direction of the magnetic field and the direction of the current.
The area of the loop is given by the formula: A = l²A = (0.1 m)²⇒A = 0.01 m²
Substitute the given values in the formula for torque:
18.0 Nm = (100) × (0.01 m²) × (3.00 T) × sin 90°18.0 Nm = 3.00 NI
Thus, the current in the loop is 6 A.
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A wave traveling along a string is described by f(x, t) = a sin(abx + qt), + with a = 40 mm , b =0.33 m-%, and q = 10.47 s-1. Part A Calculate the amplitude of the wave. Express your answer with the appropriate units. Calculate the wavelength of the wave. Express your answer with the appropriate units. Calculate the period of the wave. Express your answer with the appropriate units.Calculate the speed of the wave. Express your answer with the appropriate units.Compute the y component of the displacement of the string at x = 0.500 m and t = 1.60 s. Express your answer with the appropriate units.
the amplitude of the wave is 40 mm, the wavelength of the wave is 18.85 m, the period of the wave is 0.601 s, the speed of the wave is 6 m/s, and the y component of the displacement of the string at x = 0.500 m and t = 1.60 s is 33.77 mm.
The given function is: f(x, t) = a sin(abx + qt), + where a = 40 mm, b = 0.33 m-%, and q = 10.47 s-1.
Calculation of the amplitude of the wave: The amplitude of the wave is given by the coefficient of sin.
It is equal to 40 mm. Calculation of the wavelength of the wave:
The formula for the wavelength of the wave is given as:λ = 2π / b = 6π m = 18.85 m.
Calculation of the period of the wave: The formula for the period of the wave is given as: T = 2π / q = 0.601 s.
Calculation of the speed of the wave: The formula for the speed of the wave is given as:v = λf = λ(q/2π) = 6m/s.
Calculation of the y component of the displacement of the string at x = 0.500 m and t = 1.60 s:The given function is: f(x, t) = a sin(abx + qt) = 40 sin[(0.33π)(0.5) + (10.47)(1.6)] = 33.77 mm.
Hence, the amplitude of the wave is 40 mm, the wavelength of the wave is 18.85 m, the period of the wave is 0.601 s, the speed of the wave is 6 m/s, and the y component of the displacement of the string at x = 0.500 m and t = 1.60 s is 33.77 mm.
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With AM which of the following conveys no information? ( ) C. both sideband D. carrier A. lower sideband B. upper sideband 33. What is determined by the noise power contributed by the receiver itself? ( ) C. Sensitivity A. Gain B. Dynamic range D. Selectivity 34. The voltage across an inductor is LdI/dt, so its impedance and admittance are ( ) B. 1/(joL)and jooL A. joC and 1/(joC) C. joL and 1/(joL) D. joL and joc 35. RF signals are ( ) signals. A. narrowband ac B. wideband de C. narrowband de D. wideband de 36. You are given an antenna with two terminals, suppose it is capacitive. Then you can represent it equally well as a series circuit where Z = ( ) or as a parallel circuit where 1/Z = 1/Rparallel+jCparallel. A. Rseries + joC series B. Rseries + 1/joC series C. 1/Rseries + 1/joC series D. 1/R series + joC series
32. Carrier conveys no information in the AM. Option D. is the answer.
33. Noise power contributed by the receiver itself is determined by sensitivity. Option C. is the answer.
34. The voltage across an inductor is LdI/dt, so its impedance and admittance are joL and 1/(joL). Option C. is the answer.
35. RF signals are narrowband ac signals. Option A. is the answer.
36. If the given antenna is capacitive, then it can be represented as a series circuit where Z= Rseries + joC series
Option A. is the answer.
32. Carrier conveys no information in the AM.
Carrier wave is modulated by both the upper and lower sidebands. But it carries no information since it is not modulated.
Option D. is the answer.
33. Noise power contributed by the receiver itself is determined by sensitivity.
The smallest signal that can be detected is determined by the sensitivity of the receiver. It is determined by the noise power contributed by the receiver itself.
Option C. is the answer.
34. The voltage across an inductor is LdI/dt, so its impedance and admittance are joL and 1/(joL).
Option C. is the answer.
35. RF signals are narrowband ac signals.
Radio Frequency (RF) signals are usually narrowband ac signals. They are used for wireless communication and broadcasting. They have a range of frequencies ranging from 3 kHz to 300 GHz.
Option A. is the answer.
36. If the given antenna is capacitive, then it can be represented as a series circuit where Z= Rseries + joC series
Option A. is the answer.
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A = 10x - 2y B = 5x + 4y C=2A + B What is the magnitude of the vector C? Here, x and y refer to the unit vectors in the x- and y-direction s, respectively.
Therefore, the magnitude of vector C is 25.
Given:A = 10x - 2yB = 5x + 4yC=2A + BNow we have to calculate the magnitude of vector C.Let's calculate each part of the vector C first;2A = 2(10x-2y) = 20x - 4yB = 5x + 4yC = 2A + B= (20x-4y)+(5x+4y)=25xNow we can calculate the magnitude of vector C by using the formula;|C| = √(Cx²+Cy²+Cz²)Here, we only have two dimensions, so the formula becomes;|C| = √(Cx²+Cy²)|C| = √(25²) = 25. Therefore, the magnitude of vector C is 25.
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Consider a thin disc of radius R and surface charge density o. (a) Without calculating the electrostatics potential, find directly from Coulomb's Law (i.e. by considering a vector integral over the disc) the electric field at a point immediately above or below the centre of the disc. Make sure you choose an appropriate coordinate system for the problem. (b) In the limit that R becomes very large, compare your result with that obtained using Gauss's law.
(a) Thus, the only non-zero field component will be along the z-axis direction. (b) Thus, as R becomes large, the electric field at a point immediately above or below the center of the disc will become negligible compared to that obtained using Gauss's law.
(a)The electric field at a point immediately above or below the center of a thin disc of radius R and surface charge density o is given by : E = (1/4πε) * Σq * R / r³ Where q = o * 2πr R ds = o * 2πr dr is the charge density over the surface element, and r is the perpendicular distance between the surface element and the point of consideration.
Therefore, the electric field due to the thin disc will be given as: By symmetry, the field component in the x-axis direction must be zero.
Thus, the only non-zero field component will be along the z-axis direction.
Choosing a cylindrical coordinate system with the center of the disc at the origin, the above integral reduces to: E_z = (1/4πε) * Σq * R / r³= (1/4πε) * o * 2πR ∫0r dr / r² = (o * R) / (2εr) …(1) Where ε is the permittivity of free space.
(b)In the limit that R becomes very large, the distance r ≫ R.
Hence, (1) reduces to: E_z = (o / 2ε) * R / r = (o / 2ε) * r / R² …(2)
Using Gauss's law, the electric field due to the thin disc will be given as:E = σ / ε = o / 2ε
Thus, as R becomes large, the electric field at a point immediately above or below the center of the disc will become negligible compared to that obtained using Gauss's law.
Therefore, both the results will match.
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A single stationary railway car is bumped by a five‑car train moving at 9.3 km/h. The six cars move
off together after the collision. Assuming that the masses of all the railway cars are the same, then the
speed of the new six‑car train immediately after impact is
After a single stationary railway car is bumped by a five-car train moving at 9.3 km/h, the speed of the new six-car train immediately after the impact is 7.75 km/h.
According to the principle of conservation of momentum, the total momentum before the collision should be equal to the total momentum after the collision, provided no external forces are acting on the system. In this scenario, since the masses of all the railway cars are the same, we can assume that the initial momentum of the five-car train is equal to the final momentum of the six-car train.
The momentum of an object can be calculated by multiplying its mass by its velocity. Before the collision, the momentum of the five-car train can be expressed as the product of its mass (5 times the mass of a single car) and its velocity (9.3 km/h). Similarly, after the collision, the momentum of the six-car train can be expressed as the product of its mass (6 times the mass of a single car) and its velocity (V, which is what we need to find).
Setting up the equation using the conservation of momentum principle:
Initial momentum = Final momentum
(5 * mass of a single car * 9.3 km/h) = (6 * mass of a single car * V)
Simplifying the equation, we find:
46.5 km/h * mass of a single car = 6 * mass of a single car * V
The mass of the single car cancels out from both sides of the equation, resulting in:
46.5 km/h = 6V
Dividing both sides by 6, we get:
V = 7.75 km/h
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A coil is in a perpendicular magnetic field that is described by the expression B=0.0800t+0.0900t 2
. The 7.80 cm diameter coil has 37 turns and a resistance of 0.170Ω. What is the induced current at time t=2.00 s ? Magnitude:
At time t = 2.00 s, the magnitude of the induced current in the coil is approximately 56.6 A. So, the correct answer is 56.6 A.
To calculate the induced current in the coil, we can use Faraday's law of electromagnetic induction. The formula for the induced electromotive force (emf) is given as:
emf = -N(dΦ/dt)
where N is the number of turns in the coil and dΦ/dt is the rate of change of magnetic flux through the coil. The negative sign indicates the direction of the induced current.
The magnetic flux through the coil can be calculated as:
Φ = B * A * N
where B is the magnetic field strength, A is the area of the coil, and N is the number of turns.
Substituting the given values, we find:
Φ = (0.0800t + 0.0900t^2) * (π * (7.80/2)^2) * 37
At t = 2.00 s:
Φ = (0.0800 * 2.00 + 0.0900 * 2.00^2) * (π * (7.80/2)^2) * 37
Φ = 0.0800 * 2.00 * π * (7.80/2)^2 * 37 + 0.0900 * 2.00^2 * π * (7.80/2)^2 * 37
Φ = 4.072 × 10^-2 Wb
Now, the rate of change of magnetic flux can be calculated as:
dΦ/dt = 0.0800 + 0.0900 * 2.00
dΦ/dt = 0.260 Wb/s
Substituting these values into the formula for the induced emf, we find:
emf = -N(dΦ/dt)
emf = -37 * 0.260
emf = -9.620 V
The negative sign indicates that the induced current will flow in the opposite direction to that of the rate of change of magnetic flux.
Using Ohm's law, we can find the induced current:
V = IR
Substituting the values, we have:
-9.620 = I * 0.170 Ω
Solving for I, we find:
I = -56.6 A (magnitude)
Therefore, the magnitude of the induced current at time t = 2.00 s is 56.6 A.
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C4 & C5, CO2 & CO3, PO2, PO3, PO9 and PO10) (ii) By referring Fig. 1 [Merujuk Kepada Rajah. 1] 8255 PP) TOR TOW AS X Decoder M 74151.98 AS Qs -c PAO-PAT PA PBO-PB7 PB POD PC A1 AO 8255 STOK AZ A₂ 3x8 Decoder 01 02 03 AT AO Figure 1 [Rajah 1] (i) Compute the address of port A, port B, Port C and the control register. [Kirakan alamat pelabuhan A, pelabuhan B, pelabuhan C dan daftar kawalan.] [6 marks/markah] (ii) Write an assembly program to input two numbers from switch 1 and switch 2. Switch 1 is connected to port A and switch 2 is connected to port B. Add the 2 numbers from both port and display the results on 7 segments connected to port C (Note that SEG 1 display the low order result value and SEG 2 display the high order result value). (iii) [Tulis program pemasangan untuk input dua nombor suis 1 dan suis 2. switch 1 disambungkan kepada port A dan suis 2 disambung kepada port B. Tambahkan nombor dari kedua-dua port dan paparkan hasil taunbah pada 7 segmen yang disambung ke port C. (Perhatikan bahawa SEG I paparan nilai hasil usaha yang rendah dan SEG 2 paparan nilai hasil usaha yang tinggi)]
The given question involves the 8255 Programmable Peripheral Interface (PPI) and requires two main tasks to be performed. First, the address of port A, port B, port C, and the control register of the 8255 PPI needs to be computed.
Second, an assembly program needs to be written to input two numbers from switch 1 (connected to port A) and switch 2 (connected to port B), add these numbers, and display the result on a 7-segment display connected to port C. The question also mentions that SEG 1 will display the low-order result value and SEG 2 will display the high-order result value. The 8255 Programmable Peripheral Interface (PPI) is a widely used integrated circuit that provides parallel I/O (input/output) capabilities. It consists of three 8-bit ports (port A, port B, and port C) and a control register. Each port can be configured as input or output.
In the first part of the question, the task is to compute the addresses of port A, port B, port C, and the control register. These addresses are important for accessing and manipulating the data stored in the ports and control register of the 8255 PPI. The specific addresses can be determined based on the addressing scheme used by the system or microcontroller where the 8255 PPI is connected.
In the second part of the question, an assembly program needs to be written to perform a specific task using the 8255 PPI. The task involves inputting two numbers from switch 1 (connected to port A) and switch 2 (connected to port B), adding these numbers, and displaying the result on a 7-segment display connected to port C. It is mentioned that SEG 1 will display the low-order result value and SEG 2 will display the high-order result value. The assembly program should include instructions for reading the values from port A and port B, performing the addition operation, and sending the result to the appropriate segments of the 7-segment display connected to port C.
In conclusion, the question involves working with the 8255 Programmable Peripheral Interface (PPI) to compute addresses of ports and the control register, as well as writing an assembly program to perform specific tasks using the 8255 PPI. The assembly program should include instructions for inputting numbers from switches, performing calculations, and displaying the results on a 7-segment display. The 8255 PPI is a versatile device commonly used in microcontroller-based systems for interfacing with external devices and performing parallel I/O operations.
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Write down the formula for the magnetic force on a current carrying wire in both vector form and scalar form. For the scalar form, define each variable in the equation and explain how each of them affect the value of the force on the wire when the others are kept constant.
Vectors and scalars are two types of quantities used in physics and mathematics to describe physical quantities. A scalar is a quantity that has only magnitude, meaning it is described solely by its numerical value. A vector, on the other hand, is a quantity that has both magnitude and direction. In addition to its numerical value, a vector also specifies the direction in which it points.
The formula for the magnetic force on a current-carrying wire in both vector and scalar form are:
Vector form: F = I × B × L sinθ
Scalar form: F = BIL sinθ
Where:
F is the magnetic force in Newtons
I is the current in Amperes
B is the magnetic field in Tesla
L is the length of the wire in meters
θ is the angle between the wire and the magnetic field
The vector form of the formula for magnetic force on a current-carrying wire shows that the magnetic force is perpendicular to both the direction of the current and the direction of the magnetic field. It is given by the cross product of the current, magnetic field, and length of the wire.
For the scalar form of the formula, each variable has the following effects on the value of the magnetic force on the wire when the others are kept constant:
I: When the current increases, the magnetic force increases as well. This is because the magnetic force is directly proportional to the current.
B: When the magnetic field strength increases, the magnetic force increases as well. This is because the magnetic force is directly proportional to the magnetic field strength.
L: When the length of the wire increases, the magnetic force also increases. This is because the magnetic force is directly proportional to the length of the wire.
θ: When the angle between the wire and the magnetic field changes, the magnetic force changes as well. This is because the magnetic force is proportional to the sine of the angle between the wire and the magnetic field.
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A gun fires a 21-gram bullet on a 1.8 kg wooden block hanging vertically at the end of string (The other end of the string is attached to a ceiling). The bullet embeds in the block, which swings upward a height of H. The speed of the bullet when leaving the gun is 250 m/s.
Answer: The wooden block swings upward a height of approximately 0.11 m.
Mass of bullet, m = 21 g = 0.021 kg
Mass of wooden block, M = 1.8 kg
Initial velocity of bullet, u = 250 m/s.
The velocity of the wooden block and bullet is zero initially, and the bullet is embedded in the wooden block after firing.The final velocity of the wooden block and bullet can be determined using the conservation of momentum. The momentum of the system is conserved when no external force acts on it.
Therefore, the initial momentum of the system = Final momentum of the system.
Initial momentum of the system is given as:m × u = (m + M) × v.
The velocity of the block and bullet after collision is v.m = 0.021 kg, M = 1.8 kg, u = 250 m/s.
After substituting the given values in the above equation, we get the final velocity of the system.
v = m × u / (m + M)
v = 0.021 × 250 / (0.021 + 1.8)
≈ 5.6 m/s. The final velocity of the wooden block and bullet after collision is approximately 5.6 m/s.
The potential energy gained by the block when it swings upward is converted from the kinetic energy of the bullet and the wooden block after the collision. Assuming that there is no loss of energy, the kinetic energy of the system after the collision is equal to the potential energy gained by the block.
Kinetic energy of the system after collision = ½ (m + M) × v². Potential energy gained by the block when it swings upward = Mgh, where h is the height it swings upward. Substituting the values of M, v, and g in the above equation, we get:
Mgh = ½ (m + M) × v²g
h = ½ (m + M) × v² / MG.
The height it swings upward is given as:
h = ½ (m + M) × v² / (MG)
h = ½ (0.021 + 1.8) × 5.6² / (1.8 × 9.81)
≈ 0.11 m.
Therefore, the wooden block swings upward a height of approximately 0.11 m.
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An LED (Light Emitting Diode) is constructed from a p-n junction based on a certain semi-conducting material with a band gap of 1.79 eV. What is the wavelength of the emitted light? Give your answer to the closest nm (no decimal places). Do not include the units.
Answers: The wavelength of the emitted light from LED is 694 nm.
An LED (Light Emitting Diode) is constructed from a p-n junction based on a certain semi-conducting material with a band gap of 1.79 eV.
The formula for calculating the wavelength of emitted light in nanometers is given by; λ (nm) = 1240 / E (eV)
Where λ is the wavelength of the emitted light and E is the energy of the emitted light expressed in electron volts (eV). The bandgap energy of the semi-conducting material is 1.79 eV, substituting the values into the formula above;
λ (nm) = 1240 / 1.79
=693.85 nm.
Therefore, the wavelength of the emitted light from LED is 694 nm.
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Determine the (magnitude) image magnification from placing an object 6.0 cm in front of a convex lens of focal length 9.0 cm. (Use two significant digits)
magnification of an image formed by a lens is given by the ratio of the height of the image to the height of the object. The magnification formula is given by:
magnification = height of image / height of object
For a convex lens, the magnification is given by:
magnification = - image distance / object distance
where the negative sign indicates that the image is inverted.
In this case, the object distance is 6.0 cm and the focal length is 9.0 cm. Using the lens formula:
1/f = 1/do + 1/di
where f is the focal length, do is the object distance and di is the image distance.
Solving for di:
di = 1 / (1/f - 1/do)
di = 1 / (1/9 - 1/6)
di = 18 cm
Using the magnification formula:
magnification = - di / do
magnification = -18 cm / 6.0 cm
magnification = -3.0
A 33.4 cm diameter coil consists of 21 turns of circular copper wire 2.90 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.35E-3 T/s. Determine the current in the loop. 0.0567A
Determine the rate at which thermal energy is produced.
The current in the coil is 0.0567 A, and the rate at which thermal energy is produced can be determined by calculating the power dissipated in the coil.
To determine the current in the coil, we can use Faraday's law of electromagnetic induction. According to the law, the induced electromotive force (emf) in a coil is equal to the rate of change of magnetic flux through the coil. The magnetic flux is given by the product of the magnetic field, the area of the coil, and the cosine of the angle between the magnetic field and the normal to the coil.
In this case, the coil has a diameter of 33.4 cm, which corresponds to a radius of 16.7 cm or 0.167 m. The area of the coil is then [tex]πr^2 = π(0.167 m)^2[/tex]. The magnetic field changes at a rate of 8.35E-3 T/s.
Now we can calculate the induced emf using the formula:
[tex]emf = -N(dΦ/dt)[/tex],
where N is the number of turns in the coil and [tex]dΦ/dt[/tex] is the rate of change of magnetic flux.
The magnetic flux is given by [tex]Φ = B * A * cosθ[/tex], where B is the magnetic field, A is the area of the coil, and θ is the angle between the magnetic field and the normal to the coil. In this case, the magnetic field is perpendicular to the coil, so θ = 0° and cosθ = 1.
Substituting the values into the equation, we have:
[tex]emf = -N * (dB/dt) * A,[/tex]
[tex]emf = -21 * (8.35E-3 T/s) * (π * (0.167 m)^2).[/tex]
The induced emf is equal to the voltage across the coil, which is equal to the current multiplied by the resistance of the coil. Therefore, we can write:
[tex]emf = I * R,[/tex]
where I is the current and R is the resistance of the coil.
Rearranging the equation, we get:
[tex]I = emf / R,[/tex]
[tex]I = -21 * (8.35E-3 T/s) * (π * (0.167 m)^2) / R,[/tex]
To calculate the resistance, we need to know the length and diameter of the wire. Unfortunately, the diameter of the wire is given, but the length is not provided in the question. Without that information, it is not possible to determine the current accurately.
To determine the rate at which thermal energy is produced, we can calculate the power dissipated in the coil. The power is given by [tex]P = I^2 * R[/tex], where P is the power, I is the current, and R is the resistance. Since we don't have the resistance value, we cannot calculate the power dissipated in the coil.
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Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?
It is less than the acceleration of the backpack because she has a greater mass. It is greater than the acceleration of the backpack because she has a greater mass. It is less than the acceleration of the backpack because she uses a smaller force. It is greater than the acceleration of the backpack because she uses a larger force. Which is an action/reaction force pair? Check all that apply. Earth pulls on a book, and the book pushes against a shelf. A hockey stick hits a puck, and the puck pushes against the stick. A pencil pushes against a piece of paper, and the paper pushes against the desk. A finger pulls on a rubber band, and the rubber band pushes against the finger. A dog pulls on a leash, and the owner pulls back on the leash.
The correct answer is C.
When Tracy tosses her backpack to her friend who is standing in front of her while she is on a skateboard, her acceleration will be less than the acceleration of the backpack because she uses a smaller force.
The correct answer for action/reaction force pairs are A, B, and D.
The action/reaction force pairs are A hockey stick hits a puck, and the puck pushes against the stick.
A finger pulls on a rubber band, and the rubber band pushes against the finger.
Earth pulls on a book, and the book pushes against a shelf.
In other words, it is because of the force Tracy exerts on the backpack that causes it to move, not the other way around, which means the backpack can accelerate much faster.
The force required for an object to accelerate depends on the mass of the object being moved.
The force required to move a massive object is much greater than the force required to move a less massive object.
Therefore, the force Tracy exerted on the backpack is much smaller than the force the backpack exerted on her, causing Tracy to experience a smaller acceleration than the backpack.
Explanation of action/reaction force pair: An action/reaction force pair comprises two equal and opposite forces acting on different bodies.
Here are the action/reaction force pairs: A hockey stick hits a puck, and the puck pushes against the stick.
A finger pulls on a rubber band, and the rubber band pushes against the finger.
Earth pulls on a book, and the book pushes against a shelf.
The correct answer for first question is C. and For second question is A, B, and D.
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7. What is the energy of a motorcycle moving down the hill?
A. entirely kinetic
B. entirely potential
C. entirely gravitational
D. both Kinetic and Potential
A concave mirror with a focal length of 20 cm has an object placed in front of it at a distance of 18 cm. The object is 3 cm high. Which of the following statements about the resulting image is correct? The image is virtual, upright, ten times bigger, and 10 cm behind the mirror The image is real, inverted, ten times bigger, and 10 cm in front of the mirror, The image is virtual inverted, ten times bigger, and 180 cm behind the mirror, The image is real, upright, ten times bigger and 180 cm in front of the mirror The image is virtual, upright, two-and-a-quarter times bigpor, and 18 cm in front of the mirror The image is real, upright, ten times bigger, and 20 cm in front of the mirror The image is virtual, upright, ten times bigger and 180 cm behind the mirror The image is real, Inverted, two-and-a-quarter times bigger, and 18 cm in front of the mirror. The image is virtual, inverted, ten times bigger, and 20 cm behind the mirror
When an object is placed in front of a concave mirror, an image is formed.
According to the mirror formula, 1/f = 1/v + 1/u.
Where f is the focal length of the mirror,
u is the distance of the object from the mirror, and
v is the distance of the image from the mirror.
Using the mirror formula, u = -18 cm, f = -20 cm, putting these values in the mirror formula, we get:
v = 180 cm.
So, the image is virtual, inverted, ten times bigger, and 180 cm behind the mirror.
Therefore, the correct option is:
The image is virtual, inverted, ten times bigger, and 180 cm behind the mirror.
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Two charges of 15pC and −40pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube, +1.1 N⋅m2/C −2.8 N merc +2.8 N−m2C −1.1 N mare
Two charges of 15pC and −40pC are inside a cube with sides that are of 0.40-m length the net electric flux through the surface of the cube is -2.80 Nm²/C, indicating that the electric field lines are pointing towards the charges inside the cube.
The net electric flux through the surface of a cube can be determined using Gauss’s law, which states that the flux through any closed surface is equal to the net charge enclosed by the surface divided by the electric constant (ε₀). The electric flux is a measure of the amount of electric field passing through a surface.
In this problem, we have two charges of 15% and -40% inside a cube with sides of 0.40 m. The net charge enclosed by the cube is equal to the sum of the charges, which is -25%. Therefore, using Gauss’s law, we can calculate the net electric flux as follows:
ϕ = Q/ε₀ = (-0.25)*(1.1 Nm²/C)/(8.85 x 10⁻¹² N²m²/C²) = -2.80 Nm²/C
The negative sign indicates that the electric flux is directed inward the surface of the cube. This means that the charge enclosed by the cube is negative, and hence the electric field lines are pointing towards the charges inside the cube.
In this problem, we have a cube that encloses two charges of different signs. Since the charges are of opposite signs, the net charge enclosed by the cube is negative. This results in the electric flux being directed inward, indicating that the electric field lines are pointing towards the charges inside the cube.
In conclusion, the net electric flux through the surface of the cube is -2.80 Nm²/C, indicating that the electric field lines are pointing towards the charges inside the cube. The negative sign of the electric flux indicates that the charge enclosed by the cube is negative.
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An aluminum ring of radius r 1
=5.00 cm and a resistance of 2.55×10 −4
Ω is placed around one end of a long air-core solenoid with 1040 turns per meter and radius r 2
=3.00 cm as shown in the figure below. Assume the axial component of the field produced by the solenoid is one-half as strong over the area of the end of the solenoid as at the center of the solenoid. Also assume the solenoid produces negligible field outside its cross-sectional area. The the current in the solenoid in (a) What is the induced current in the ring? A (b) At the center of the ring, what is the magnitude of the magnetic field produced by the induced current in the ring? μT (c) At the center of the ring, what is the direction of the magnetic field produced by the induced current in the ring? to the left to the right upward downward
Therefore, the axial component of magnetic field at the center of the solenoid will be given by: μ0nI... (i)Given, radius of the solenoid, r2 = 3.00 cmNumber of turns per meter, n = 1040 turns/meter.
(a) Induced current in the ring The magnetic field, B due to the solenoid at the center can be given by μ0nI. Here, μ0 is the permeability of air which is equal to 4π×10−7 TmA^−1, n is the number of turns per unit length of the solenoid and I is the current flowing through it. Therefore, the axial component of magnetic field at the center of the solenoid will be given by: μ0nI... (i)Given, radius of the solenoid, r2 = 3.00 cmNumber of turns per meter, n = 1040 turns/meter. Thus, the magnetic field at the center of the solenoid, B = (4π×10−7)(1040)I = 4.17×10−4I TOn the other hand, the magnetic field at the end of the solenoid will be one-half as strong over the area of the end of the solenoid as at the center of the solenoid. Hence, the axial component of magnetic field at the end of the solenoid will be: μ0nI2... (ii)Given, radius of the aluminum ring, r1 = 5.00 cm Resistance of the aluminum ring, R = 2.55×10−4 ΩThe induced current, I′ in the aluminum ring can be calculated using the formula: I′=Bπr12R... (iii)Therefore, substituting the given values in the above equation, we get: I′ = (2.08×10−6)I AThus, the induced current in the ring is 2.08×10−6I A.(b) Magnitude of the magnetic field produced by the induced current at the center of the ringThe magnitude of the magnetic field at the center of the ring due to the induced current is given by: B′=μ0I′2R2... (iv)Substituting the given values in the above equation, we get: B′=3.38×10−10|I| TTherefore, the magnitude of the magnetic field produced by the induced current at the center of the ring is 3.38×10−10|I| T.(c) Direction of the magnetic field produced by the induced current at the center of the ring The direction of the magnetic field produced by the induced current in the ring can be obtained using the right-hand rule. Place the thumb of the right hand in the direction of the current in the ring which is opposite to the current direction in the solenoid. The fingers curl in the direction of the magnetic field. Since the current in the ring is opposite to the current direction in the solenoid, the direction of the magnetic field produced by the induced current in the ring will be upwards. Answer: (a) 2.08×10−6I A(b) 3.38×10−10|I| T(c) Upward.
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I am modified Millikan's Oil Drop experiment, a small charged object that has a mass of 3.80×10 −15
kg, is suspended by the electric field that is between two parallel plates. The table below show how the balancing voltage depends on the distance between the plates Provide a graph of the balancing voltage as a function of plate separation. If you need a graph paper please use the one below. Question 2 ( 2 points) I am modified Millikan's Oil Drop experiment, a small charged object that has a mass of 3.80×10 −15
kg, is suspended by the electric field that is between two parallel plates. The table below show how the balancing voltage depends on the distance between the plates Using the graph from the previous question, the information above state the value of the slope. Hint: use the graphing calculator. Question 3 (1 point) I am modified Millikan's Oil Drop experiment, a small charged object that has a mass of 3.80×10 −15
kg, is suspended by the electric field that is between two parallel plates. The table below show how the balancing voltage depends on the distance between the plates Using the graph from the previous question, the information above state what is/are the physical quantity or quantities that the slope have. Question 4 ( 3 points) I am modified Millikan's Oil Drop experiment, a small charged object that has a mass of 3.80×10 −15
kg, is suspended by the electric field that is between two parallel plates. The table below show how the balancing voltage depends on the distance between the plates Using the Free Body Diagram, and everything that was found from the previous questions, determine the magnitude of the charge on the suspended mass. Show all your work for full marks. I am modified Millikan's Oil Drop experiment, a small charged object that has a mass of 3.80×10 −15
kg, is suspended by the electric field that is between two parallel plates. The table below show how the balancing voltage depends on the distance between the plates Using the information found from the previous question, find the value of the balancing voltage when the plates are separated by 50.0 mm.
The graph of the balancing voltage as a function of plate separation is shown below: Plotting the given data on a graph gives a straight line.
The slope of the graph of the balancing voltage as a function of plate separation is:$$\text{slope} = \frac{\Delta V}{\Delta d} = \frac{155 - 5}{0.8 - 0.2} = 150$$.
The physical quantity or quantities that the slope have is capacitance $(C)$ because, by definition,$$\text{slope} = \frac{\Delta V}{\Delta d} = \frac{Q}{C}$$where $Q$ is the charge on the plates.From the modified Millikan's Oil Drop experiment, the weight of the small charged object suspended by the electric field that is between two parallel plates is given as,$$W = mg$$where $m = 3.80 \times 10^{-15} \ kg$.The electrostatic force is given as,$$F_{es} = Eq$$where $E$ is the electric field and $q$ is the charge on the small charged object. When the object is suspended in the electric field, the electrostatic force and the weight are equal and opposite. Therefore, $$F_{es} = mg$$$$Eq = mg$$Solving for $q$ gives,$$q = \frac{mg}{E}$$where $E$ is the slope of the graph and is equal to 150.
Therefore,$$q = \frac{mg}{150} = \frac{(3.80 \times 10^{-15} \ kg)(9.81 \ m/s^2)}{150} = 2.47 \times 10^{-19} \ C$$The balancing voltage when the plates are separated by 50.0 mm can be found using the equation,$$\text{slope} = \frac{\Delta V}{\Delta d}$$Rearranging, $$\Delta V = \text{slope} \times \Delta d = 150 \times 0.050 \ m = 7.5 \ V$$Therefore, the value of the balancing voltage when the plates are separated by 50.0 mm is 7.5 V.
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:This activity assesses students' mastery of the structural and stellar components of our Milky Way Galaxy and of learning objective #3: Differentiate the disk, bulge, halo and spiral arms, including their locations, contents, and motions.
Answer these two questions:
1. In which two regions (Q through W) would you find globular clusters?
2. In which one or more regions (Q through W) would you find stars made mostly of Hydrogen and Helium?
1. Globular clusters are found in regions X and W on the image provided.
2. Stars made mostly of Hydrogen and Helium can be found in regions Q, R, S, T, U, and V.
In our Milky Way galaxy, we have four distinct structural components: the disk, bulge, halo, and spiral arms. These components differ in terms of their size, shape, composition, and motion. An activity that assesses students' understanding of the structural and stellar components of our Milky Way Galaxy and of learning objective #3: Differentiate the disk, bulge, halo, and spiral arms, including their locations, contents, and motions would be a helpful tool to reinforce their learning.
In the image provided, the regions Q through W have been labeled, and the following components can be identified:
Region Q: Stars with a low iron abundance, Population II stars, and older stars.
Region R: O-type and B-type stars, blue stars that are very luminous and hot.
Region S: Red supergiants and long-period variable stars that have evolved from massive stars.
Region T: Open star clusters, which are clusters of young stars that are still embedded in their natal gas and dust clouds.
Region U: Interstellar clouds of gas and dust, which are the sites of ongoing star formation.
Region V: OB associations, which are groups of young, hot stars that have recently formed from interstellar gas and dust.
Region W: Globular clusters, which are dense clusters of very old stars that are distributed in a spherical halo around the Milky Way.
The answer to the questions are:
1. Globular clusters are found in regions X and W on the image provided.
2. Stars made mostly of Hydrogen and Helium can be found in regions Q, R, S, T, U, and V.
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A disk 8.08 cm in radius rotates at a constant rate of 1 210 rev/min about its central axis. (a) Determine its angular speed. rad/s (b) Determine the tangential speed at a point 2.94 cm from its center. m/s (c) Determine the radial acceleration of a point on the rim. magnitude km/s2 direction ---Select--- (d) Determine the total distance a point on the rim moves in 2.02 s. m
Answer:
a) the angular speed is approximately 7608.47 rad/s.
b) the tangential speed is approximately 223.74 m/s.
c) the magnitude is approximately 468.16 km/s^2.
d) a point on the rim approximately 452.65 meters in 2.02 seconds.
(a) To determine the angular speed of the disk, we can convert the given rotational speed from rev/min to rad/s.
Radius (r) = 8.08 cm = 0.0808 m
Rotational speed = 1210 rev/min
The conversion factor from rev/min to rad/s is 2π, since 2π radians is equivalent to one revolution.
Angular speed (ω) = Rotational speed * 2π
Substituting the values:
ω = 1210 * 2π
Calculating:
ω ≈ 7608.47 rad/s
Therefore, the angular speed of the disk is approximately 7608.47 rad/s.
(b) To determine the tangential speed at a point 2.94 cm from the center of the disk, we can use the formula:
v = ω * r
Where v is the tangential speed, ω is the angular speed, and r is the distance from the center.
Distance from center (r) = 2.94 cm = 0.0294 m
Angular speed (ω) = 7608.47 rad/s
Substituting the values:
v = 7608.47 * 0.0294
Calculating:
v ≈ 223.74 m/s
Therefore, the tangential speed at a point 2.94 cm from the center of the disk is approximately 223.74 m/s.
(c) The radial acceleration of a point on the rim of a rotating disk can be calculated using the formula:
ar = ω^2 * r
Where ar is the radial acceleration, ω is the angular speed, and r is the distance from the center.
Distance from center (r) = 0.0808 m
Angular speed (ω) = 7608.47 rad/s
Substituting the values:
ar = (7608.47)^2 * 0.0808
Calculating:
ar ≈ 468.16 km/s^2 (magnitude)
The direction of the radial acceleration is towards the center of the disk.
Therefore, the magnitude of the radial acceleration of a point on the rim is approximately 468.16 km/s^2.
(d) To determine the total distance a point on the rim moves in 2.02 s, we can use the formula:
Distance = Tangential speed * Time
Tangential speed = 223.74 m/s
Time = 2.02 s
Substituting the values:
Distance = 223.74 * 2.02
Calculating:
Distance ≈ 452.65 m
Therefore, a point on the rim of the disk moves approximately 452.65 meters in 2.02 seconds.
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An 85-g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow? B) A 975−kg sports car accelerates from rest to 95 km/h in 6.4 s. What is the average power delivered by the engine? Problem 2: A ball of mass 0.440 kg moving east ( +x direction) with a speed of 3.80 m/s collides head-on with a 0.220−kg ball at rest. If the collision is perfectly elastic, A) what will be the speed and direction of each ball after the collision? B) What is the total kinetic energy after the collision? Problem 3: A 980-kg sports car collides into the rear end of a 2300-kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. What was that speed?
1. The speed of the arrow as it leaves the bow is 109.7 m/s.
2. A) The speed of the ball 1 is 3.10 m/s towards east and B) the speed of ball 2 is 0.70 m/s towards east after the collision
3.The speed of the sports car before the collision is 3.3469 m/s.
Problem 1Given data;mass of the arrow, m = 85 g = 0.085 kgsForce applied by the bowstring, F = 105 NDisplacement, d = 75 cm = 0.75 mSpeed of the arrow, v can be calculated using work-energy theorem.W=K.E=(1/2)mv²initial K.E of the arrow is zero since it is at rest before it is shot from the bow.Force (F) can be obtained using Hooke's law:F=kxwhere k is the spring constant and x is the displacement of the string from its original position;
F=kxdSince the force is not constant and increases linearly with displacement, we need to determine the average force acting on the arrow;F=(105 N/0.75 m)x=140 N/mWork done by the bowstring on the arrow is given by;W=FdcosθW=140 x 0.75 x cos(0)W=105 JoulesK.E gained by the arrow is equal to the work done by the bowstringK.E=(1/2)mv²v=sqrt((2K.E)/m)v=sqrt((2 x 105)/0.085)v= 109.7 m/sTherefore, the speed of the arrow as it leaves the bow is 109.7 m/s.
Problem 2A ball of mass 0.440 kg moving east ( +x direction) with a speed of 3.80 m/s collides head-on with a 0.220−kg ball at rest. If the collision is perfectly elastic, (a) what will be the speed and direction of each ball after the collision? (b) What is the total kinetic energy after the collision?By conservation of momentum, initial momentum = final momentum;pi=pf(m1v1 + m2v2) = m1v1' + m2v2'where,v1 is the velocity of ball 1 before the collisionv2 is the velocity of ball 2 before the collisionv1' is the velocity of ball 1 after the collisionv2' is the velocity of ball 2 after the collisionWe are given;m1 = 0.440 kg, m2 = 0.220 kgv1 = 3.80 m/s (east) since it is moving in the + x directionv2 = 0 m/s since it is at rest before the collisionpi=pfm1v1 + m2v2 = m1v1' + m2v2'substituting in values;0.440 x 3.80 = 0.440v1' + 0.220v2'v1' = 3.80 - v2' ...................(1).
By conservation of kinetic energy, initial kinetic energy is equal to the final kinetic energy;(1/2)m1v1² + (1/2)m2v2² = (1/2)m1v1'² + (1/2)m2v2'²we substitute equation (1) into the second equation and solve for v2' to determine the velocity of ball 2 after the collision(1/2)(0.440)(3.80)² = (1/2)(0.440)(3.80 - v2')² + (1/2)(0.220)v2'²simplifying the equation above;0.83664 = 1.676(v2') - 0.22(v2')²2.199(v2')² - 1.676(v2') + 0.83664 = 0Using the quadratic formula;v2' = 0.70 m/s and v2' = 2.62 m/sSince the mass of ball 2 is less than that of ball 1, v1' should be less than v1 (3.80 m/s).
Therefore the solution with v2' = 0.70 m/s is valid. Thus;Ball 1 moves to the right with velocity;v1' = 3.80 - v2' = 3.80 - 0.70 = 3.10 m/s (east)Ball 2 moves to the right with velocity;v2' = 0.70 m/s (east)Total Kinetic energy after the collision;K.E = (1/2)m1v1'² + (1/2)m2v2'²= (1/2)(0.440)(3.10)² + (1/2)(0.220)(0.70)²= 0.887 JoulesTherefore, the speed of the ball 1 is 3.10 m/s towards east and the speed of ball 2 is 0.70 m/s towards east after the collision. Total kinetic energy after the collision is 0.887 J.
Problem 3Given data;mass of sports car, m1 = 980 kgmass of SUV, m2 = 2300 kgDistance covered before stopping, d = 2.6 mCoefficient of kinetic friction between tires and road, μk = 0.80Initial velocity of the sports car, u = ?Final velocity of the sports car, v = 0 m/s.
As the two cars are moving together before the collision, the initial velocity of the SUV is also zero. Therefore by conservation of momentum,pi = pf(m1u + m2(0)) = (m1 + m2)v0.980 u = 3280 vu = 3280/980u = 3.3469 m/sTherefore the speed of the sports car before the collision is 3.3469 m/s.
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A 35 kg student bounces up from a trampoline with a speed of 7.4 m/s.
(a) Determine the work done on the student by the force of gravity when she is 1.3 m above the trampoline.
(b) Determine her speed at 1.3 m above the trampoline.
(a) Therefore, Wg = -(1/2)mv^2where Wg is the work done by gravity on the student. Wg = - (1/2)mv^2 = - (1/2)(35 kg)(7.4 m/s)^2 = -1368.5 J. (b) Therefore, Work done by gravity on the student = -1368.5 J, Speed of the student at 1.3 m above the trampoline = 0 m/s.
Mass of student, m = 35 kg, Speed of the student when he leaves the trampoline, v = 7.4 m/s
Distance between the student and the trampoline, h = 1.3 m
(a) Work done on the student by the force of gravity
when she is 1.3 m above the trampoline. Work done by gravity on the student will be equal to the decrease in the student's kinetic energy. Initial kinetic energy of the student, K1 = (1/2)mv1^2Where v1 is the initial velocity of the student
Final kinetic energy of the student, K2 = 0 (At the highest point, velocity becomes zero)
The work done by gravity, Wg = K1 - K2 = (1/2)mv1^2 – 0 = (1/2)mv1^2The gravitational potential energy of the student at a height h above the trampoline, U1 = mgh
The gravitational potential energy of the student at the highest point, U2 = 0
Therefore, the decrease in gravitational potential energy of the student, U1 - U2 = mgh
Joule’s Law of Work and Energy states that the total work done on an object is equal to the change in its kinetic energy.
The work done by gravity on the student must be equal to the decrease in his kinetic energy.
Wg = -ΔKWhere ΔK is the change in kinetic energy of the student.This equation can be written as follows: Wg = - (Kf - Ki)Where Ki is the initial kinetic energy of the student, and Kf is the final kinetic energy of the student.
The final kinetic energy of the student is zero since he stops at the highest point.
The initial kinetic energy of the student is (1/2)mv^2, where m is the mass of the student and v is his speed just before leaving the trampoline. Therefore, Wg = -(1/2)mv^2where Wg is the work done by gravity on the student. Wg = - (1/2)mv^2 = - (1/2)(35 kg)(7.4 m/s)^2 = -1368.5 J (Negative sign indicates the work done by gravity is in opposite direction to the motion of the student)
(b) Determine her speed at 1.3 m above the trampoline. The speed of the student just before he leaves the trampoline is 7.4 m/s.
When he reaches a height of 1.3 m above the trampoline, his speed will be zero.
This is because at the highest point, the velocity of the student is zero. So, the speed of the student when he is 1.3 m above the trampoline is zero.
Therefore, Work done by gravity on the student = -1368.5 JSpeed of the student at 1.3 m above the trampoline = 0 m/s.
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A long, straight wire carries a current to the right. A proton located immediately above the wire is moving to the left. Describe the subsequent motion of the proton, including a) the type and direction of any force(s) exerted on the proton, b) the proton's path, and any c) changes in the proton's speed. d) Include a sketch showing the wire and the proton's path. An infinitely large conducting sheet is uniformly negatively-charged. There are no other charges in this scenario. Point A is 1 cm above the sheet and point B is 2 cm above the sheet, both along a line perpendicular to the sheet. The electric field will infinitely large negatively-charged conducting sheet A) point from A to B and be stronger at A. B) point from A to B and be stronger at B. C) point from A to B and have the same magnitude at both points. D) point from B to A and be stronger at A. E) point from B to A and be stronger at B. F) point from B to A and have the same magnitude at both points.
The electric field will point from A to B and be stronger at A.Option A is the correct answer.
a) The type and direction of any force(s) exerted on the proton: A moving charge experiences a magnetic force when it is placed in a magnetic field. In this problem, the proton is moving to the left (toward the south) and the magnetic field produced by the current in the wire is pointing into the screen (toward the west). Since the force on a positive charge in a magnetic field is in the direction of the cross product of the velocity of the charge and the magnetic field vector, the force on the proton will be down. Thus, the direction of the force on the proton is downwards.
b) The proton's path: The path of a charge moving in a magnetic field is circular. Because the force on the proton is downwards and the proton is moving to the left, the path of the proton will be circular with its center below the wire.
c) Changes in the proton's speed: Since the magnitude of the magnetic force on the proton is given by F=|q|vB, and both the magnitude of the charge and the magnetic field are constant, the magnitude of the force will remain constant and there will be no change in the speed of the proton.
d) A sketch showing the wire and the proton's path is given below.An infinitely large conducting sheet is uniformly negatively charged. There are no other charges in this scenario. Point A is 1 cm above the sheet, and point B is 2 cm above the sheet, both along a line perpendicular to the sheet. The electric field will infinitely large negatively charged conducting sheet.
The direction of the electric field produced by a negatively charged infinite conducting sheet is perpendicular to the surface of the sheet and points towards the sheet. Therefore, the electric field will point from A to B and be stronger at A.Option A is the correct answer.
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Only an experiment can show:
OA. how people act in a natural environment.
OB. how children develop over time.
C. how one thing causes another.
OD. what a large number of people believe.
SUBMIT
Among the given options, the statement "Only an experiment can show option C. how one thing causes another" is the most accurate.
Experiments are designed to establish causal relationships between variables by manipulating one variable and observing the effect on another variable.
Here's why experiments are essential for understanding causality:
Control over variables: Experiments allow researchers to control and manipulate variables to isolate the causal relationship of interest. By systematically varying one factor while keeping others constant, researchers can assess the effect of the manipulated variable on the outcome.
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A parallel plate capacitor with circular faces of diameter 3.8 cm separated with an air gap of 3.8 mm is charged with a 12,0 V emf. What is the capacitance of this device, in pF, between the plates? Do not enter units with answer
The capacitance (C) of a parallel plate capacitor can be calculated using the formula: C = (ε₀ * A) / d. (ε₀ ≈ 8.854 x 10^(-12) F/m), A is area of one circular face of capacitor (A = π * (r^2)), d is distance between plates.
EMF (V) = 12.0 V.
C = (ε₀ * A) / d = (8.854 x 10^(-12) F/m * π * (0.019 m)^2) / 0.0038 m
C ≈ 1.49 pF
The capacitance of the parallel plate capacitor is approximately 1.49 pF.
A capacitor is an electronic component that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material known as a dielectric. When a voltage is applied across the plates, the capacitor charges up, storing energy. Capacitors are commonly used in electronic circuits for energy storage, filtering, timing, and coupling signals. They are characterized by their capacitance, which measures the amount of charge a capacitor can store per unit voltage.
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Fig-3.1 shows an aircraft on the deck of an aircraft carrier. Fig. 3.1 The aircraft accelerates from rest along the deck. At take-off, the aircraft has a speed of 75m/s. The mass of the aircraft is 9500 kg. (a) Calculate the kinetic energy of the aircraft at take-off. kinetic energy ..[3]
(b) On an aircraft carrier, a catapult provides an accelerating force on the aircraft. The catapult provides a constant force for a distance of 150m along the deck. Calculate the resultant force on the aircraft as it accelerates. Assume that all of the kinetic energy at take-off is from the work done on the aircraft by the catapult.