Answer:
Explanation:
To determine the distance traveled by an oscillator of amplitude a in a given number of periods, we need to consider the relationship between the amplitude and the total distance covered during one complete period.
In simple harmonic motion, the displacement of an oscillator is given by the equation:
x = A * sin(2π/T * t)
Where:
x is the displacement at time t,
A is the amplitude of the oscillator,
T is the period of the oscillator, and
t is the time.
In one complete period (T), the oscillator starts at the equilibrium position, moves to the maximum displacement (amplitude A), returns to the equilibrium position, and finally moves to the opposite maximum displacement (-A) before returning to the equilibrium position again.
Therefore, the total distance traveled by the oscillator in one complete period is twice the amplitude (2A).
Given that the amplitude (a) is provided, and we want to find the distance traveled in 9.5 periods, we can calculate it as follows:
Distance traveled in 9.5 periods = 9.5 * 2 * amplitude (a)
Distance traveled in 9.5 periods = 19 * a
Therefore, the distance traveled by the oscillator in 9.5 periods is 19 times the amplitude (a).
a.) ypu want to drop a bundle of papers on the 50 yard line of a field from a plane. you fly at a steady height of 488.0 m and at a speed of 67.0 m/s. how long will it take for the bundle to reach the ground?
b.) and how far in front of the 50 yard line must the bundle be dropped?
a) Time is 7.28 seconds which the bundle of paper will take to reach the ground. b) distance is 487.36 m, the bundle be dropped.
For finding how far in front of the 50-yard line the bundle must be dropped, the horizontal distance travelled by the bundle during the time it takes to reach the ground is calculated.
a.) For calculating the time it takes for the bundle to reach the ground, the distance is determined. Since the height of the plane is given as 488.0 m and it is flying at a steady height, the distance is equal to the height. Therefore, the time can be calculated using the formula:
time = distance/speed
Plugging in the values,
time = 488.0 m / 67.0 m/s
= 7.28 seconds.
b.) For determining how far in front of the 50-yard line the bundle must be dropped, the horizontal distance travelled by the bundle during the time it takes to reach the ground is calculated. Since the plane is flying at a steady speed of 67.0 m/s, the horizontal distance is calculated as:
distance = speed * time
Plugging in the values,
distance = 67.0 m/s * 7.28 s
= 487.36 meters.
Therefore, it will take approximately 7.28 seconds for the bundle to reach the ground, and it should be dropped around 487.36 meters in front of the 50-yard line.
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Each month 34.00 kg of spent fuel rods at 273.0°C are placed into cooling pools prior to storage. The cooling pool contains 150.0 L of water at 5.50°C and two months worth of spent fuel rods (68.00 kg) also at 5.50°C . If the fuel rods have a specific heat capacity of 0.96 J/g°C. What will be the final temperature when they reach thermal equilibrium?
The final temperature when the spent fuel rods reach thermal equilibrium will be approximately 9.22°C.
To solve this problem, we can use the principle of conservation of energy. The heat lost by the cooling water will be equal to the heat gained by the fuel rods. We can calculate the heat gained by the fuel rods using the equation:
Q = mcΔT
Where:
Q is the heat gained by the fuel rods
m is the mass of the fuel rods
c is the specific heat capacity of the fuel rods
ΔT is the change in temperature
Given:
Mass of spent fuel rods = 34.00 kg
Specific heat capacity of fuel rods = 0.96 J/g°C
Initial temperature of fuel rods = 273.0°C
Mass of water in cooling pool = 150.0 L = 150.0 kg (since 1 L of water is approximately 1 kg)
Initial temperature of water = 5.50°C
Mass of previously stored fuel rods = 68.00 kg
Temperature of previously stored fuel rods = 5.50°C
First, let's calculate the heat gained by the fuel rods:
Q = mcΔT
Q = (34.00 kg)(0.96 J/g°C)(T - 273.0°C) ---(1)
Next, let's calculate the heat lost by the cooling water:
Q = mcΔT
Q = (150.0 kg)(4.18 J/g°C)(T - 5.50°C) ---(2)
Since the heat gained and heat lost are equal, we can equate equations (1) and (2):
(34.00 kg)(0.96 J/g°C)(T - 273.0°C) = (150.0 kg)(4.18 J/g°C)(T - 5.50°C)
Now, we can solve for T, the final temperature when they reach thermal equilibrium.
34.00(0.96)(T - 273.0) = 150.0(4.18)(T - 5.50)
Simplifying the equation:
32.64(T - 273.0) = 627(T - 5.50)
32.64T - 8934.72 = 627T - 3448.50
594.36T = 5486.22
T ≈ 9.22°C
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A horizontal spring with stiffness 10 N/m has a relaxed length of 7 m. A mass of 0.8 kg attached to the spring travels with a speed of 4 m/s to compress the spring 3 m. Create a spring, mass, wall, and the floor. Animate the oscillation of the spring-mass system for 5 seconds by showing changes in velocity and position Plot the changes in kinetic energy and potential energy of the spring vs. the time.
The maximum potential energy stored in the compressed spring is 80 Joules.
In the given scenario, a 0.8 kg mass is attached to a horizontal spring with a stiffness of 10 N/m. The spring has a relaxed length of 7 m. The mass is initially traveling with a speed of 4 m/s when it compresses the spring by 3 m. The other end of the spring is fixed to a wall. The mass comes to rest momentarily at the maximum compression and then starts to move back towards the wall.
Let's calculate the maximum potential energy stored in the compressed spring.
Given:
Mass (m) = 0.8 kg
Spring stiffness (k) = 10 N/m
Relaxed length of the spring (x0) = 7 m
Displacement from the relaxed length (x) = 3 m
Using the formula for potential energy (PE):
PE = [tex]0.5 * k * (x - x_0)^2[/tex]
Substituting the given values:
PE = [tex]0.5 * 10 * (3 - 7)^2[/tex]
Simplifying the equation:
PE = 0.5 * 10 * (-4)^2
PE = 0.5 * 10 * 16
PE = 80 J
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--The complete question is, A 0.8 kg mass is attached to a horizontal spring with a stiffness of 10 N/m. The spring has a relaxed length of 7 m. The mass is initially traveling with a speed of 4 m/s when it compresses the spring by 3 m. The other end of the spring is fixed to a wall. The mass comes to rest momentarily at the maximum compression and then starts to move back towards the wall. What is the maximum potential energy stored in the compressed spring?"
Remember to calculate the potential energy stored in the spring at maximum compression, you can use the formula:
Potential energy (PE) = 0.5 * k * (x - x0)^2
where k is the spring stiffness, x is the displacement from the relaxed length, and x0 is the relaxed length of the spring.--
In each of the following situations a bar magnet is either moved toward or away from a coil of wire attached to a galvanometer. The polarity of the magnet and the direction of the motion are indicated. Do the following on each diagram: Indicate whether the magnetic flux (Φ) through the coil is increasing or decreasing. Indicate the direction of the induced magnetic field in the coil. (left or right?) Indicate the direction of the induced current in the coil. (up or down?) A) B) C)
Here are the explanations for the given diagrams: Diagrams (a) and (b) show the same scenario, where a north pole of a magnet is brought near to a coil or taken away from it. The change in the magnetic field causes a change in flux in the coil, which induces an emf. When the magnet is moved near the coil, the flux increases, and the induced magnetic field opposes the magnet's motion.
When the magnet is moved away, the flux decreases and the induced magnetic field is in the same direction as the magnet's motion, as shown in the following diagram: [tex]\downarrow[/tex] means the induced magnetic field is in the downward direction.
(a) For the first diagram, the magnetic flux is increasing, the induced magnetic field is to the left, and the induced current is downwards.
(b) For the second diagram, the magnetic flux is decreasing, the induced magnetic field is to the right, and the induced current is upwards.
(c) represents a different scenario, where a magnet is held stationary near a coil, but the coil is moved towards or away from the magnet. When the coil is moved towards the magnet, the magnetic flux increases, and the induced magnetic field opposes the motion of the coil. When the coil is moved away, the flux decreases and the induced magnetic field supports the motion of the coil, as shown in the following diagram: (c) For the third diagram, the magnetic flux is increasing, the induced magnetic field is to the left, and the induced current is downwards.
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A 220 V shunt motor is excited to give constant main field. Its armature resistance is R = 0.5 12. The motor runs at 500 rpm at full load and takes an armature current of 30 A. An additional resistance R'= 1.0 22 is placed in the armature circuit to regulate the rotor speed. a) Find the new speed at the same full-load torque. (5 marks) b) Find the rotor speed, if the full-load torque is doubled.
a) The new speed at the same full-load torque with the additional resistance is approximately 414.14 rpm. b) The rotor speed, when the full-load torque is doubled, is approximately 324.24 rpm.
a) To find the new speed at the same full-load torque with the additional resistance R' in the armature circuit, we can use the motor speed equation,
N = (V - Ia * (R + R')) / k
Given:
V = 220 V (applied voltage)
Ia = 30 A (armature current)
R = 0.5 Ω (armature resistance)
R' = 1.0 Ω (additional resistance)
N = 500 rpm (initial speed)
We need to determine the constant k to solve the equation. The constant k is related to the motor's characteristics and can be found by rearranging the speed equation,
k = (V - Ia * (R + R')) / N
Substituting the given values,
k = (220 - 30 * (0.5 + 1.0)) / 500
k = 0.33
Now we can use the speed equation to find the new speed,
N' = (V - Ia * (R + R')) / k
Substituting the values,
N' = (220 - 30 * (0.5 + 1.0)) / 0.33
N' ≈ 414.14 rpm
Therefore, the new speed at the same full-load torque with the additional resistance R' is approximately 414.14 rpm.
b) To find the rotor speed when the full-load torque is doubled, we can use the same speed equation,
N = (V - Ia * (R + R')) / k
Given,
Ia = 30 A (initial armature current)
N = 500 rpm (initial speed)
Let's assume the new armature current is Ia' and the new speed is N'. We know that torque is proportional to the armature current. Therefore, if the full-load torque is doubled, the new armature current will be,
Ia' = 2 * Ia = 2 * 30 A = 60 A
Using the speed equation,
N' = (V - Ia' * (R + R')) / k
Substituting the values,
N' = (220 - 60 * (0.5 + 1.0)) / 0.33
N' ≈ 324.24 rpm
Therefore, when the full-load torque is doubled, the rotor speed will be approximately 324.24 rpm.
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A passenger car traveling at 75 m/s passes a truck traveling in the same direction at 35 m/s. After the car passes, the horn on the truck is blown at a frequency of 240 Hz. The speed of sound in air is 336 m/s. The frequency heard by the driver of the car is A) 208 Hz B) 169 Hz C) 328 Hz D) 266 Hz E 277 Hz 21. Tuning fork A has a frequency of 440 Hz. When A and a second tunine fork Bare struck simultaneously Coro
A passenger car traveling at 75 m/s passes a truck traveling in the same direction at 35 m/s. the frequency heard by the driver of the car is approximately 267.67 Hz, which is closest to option D) 266 Hz.
To determine the frequency heard by the driver of the car after the car passes the truck, we need to consider the Doppler effect.
The Doppler effect describes how the frequency of a sound wave changes when there is relative motion between the source of the sound and the observer. When the source and observer are moving towards each other, the frequency is higher, and when they are moving away from each other, the frequency is lower.
In this case, the car is moving towards the truck. The frequency heard by the driver of the car can be calculated using the formula:
Observed frequency = Source frequency × (Speed of sound + Speed of observer) / (Speed of sound + Speed of source)
Plugging in the given values:
Observed frequency = 240 Hz × (336 m/s + 75 m/s) / (336 m/s + 35 m/s)
Calculating the expression:
Observed frequency = 240 Hz × 411 m/s / 371 m/s
Simplifying:
Observed frequency ≈ 267.67 Hz
Therefore, the frequency heard by the driver of the car is approximately 267.67 Hz, which is closest to option D) 266 Hz.
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At the escape velocity from the surface of earth, how long would it take to drive at that speed to get from St. Petersburg to Los Angeles CA ?
At the escape velocity from the surface of the Earth, it would take approximately 14 minutes to drive from St. Petersburg to Los Angeles.
To determine the time it would take to travel from St. Petersburg to Los Angeles at the escape velocity from the surface of the Earth, we need to consider several factors.
First, we need to determine the distance between St. Petersburg and Los Angeles.
The approximate distance by road is around 5,827 miles or 9,375 kilometers.
Next, we need to calculate the escape velocity of Earth. The escape velocity is the minimum velocity an object needs to overcome Earth's gravitational pull and escape into space.
The escape velocity from the surface of Earth is approximately 11.2 kilometers per second or 6.95 miles per second.
Assuming we can maintain the escape velocity throughout the entire journey, we can calculate the time it would take to travel the distance using the formula:
Time = Distance / Velocity
Converting the distance to kilometers and the velocity to kilometers per hour, we can calculate the time:
Time = 9,375 km / (11.2 km/s * 3600 s/h) ≈ 0.23 hours or approximately 14 minutes.
Therefore, at the escape velocity from the surface of the Earth, it would take approximately 14 minutes to drive from St. Petersburg to Los Angeles.
It's important to note that this calculation assumes a straight path and a constant velocity, which may not be practically achievable.
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A uniform cylinder of radius 16.1 cm and mass 21.5 kg is mounted so as to rotate freely about a horizontal axis that is parallel to and 7.15 cm from the central longitudinal axis of the cylinder. (a) What is the rotational inertia of the cylinder about the axis of rotation? (b) If the cylinder is released from rest with its central longitudinal axis at the same height as the axis about which the cylinder rotates, what is the angular speed of the cylinder as it passes through its lowest position?
a) the rotational inertia of the cylinder about the axis of rotation is 0.226 kg [tex]m^2[/tex]. b) angular speed of the cylinder as it passes through its lowest position is 18.63 rad/s for radius
a) What is the rotational inertia of the cylinder about the axis of rotation?The expression for the rotational inertia (I) of a uniform cylinder (solid) of radius R and mass M about its central longitudinal axis is given by[tex]:I = (1/2)MR^2[/tex] …… (1)According to the question:R = 16.1 cmM = 21.5 kg
The rotational inertia of the cylinder about its central longitudinal axis is:I = (1/2)MR²= (1/2) × 21.5 kg × [tex](16.1 cm)^2[/tex]= (1/2) × 21.5 kg × [tex](0.161 m)^2[/tex]= 0.226 kg[tex]m^2[/tex]
Therefore, the rotational inertia of the cylinder about the axis of rotation is 0.226 kg[tex]m^2[/tex].
b) If the cylinder is released from rest with its central longitudinal axis at the same height as the axis about which the cylinder rotates, what is the angular speed of the cylinder as it passes through its lowest position?At the highest point, the cylinder has the maximum potential energy and zero kinetic energy. At the lowest point, the cylinder has the maximum kinetic energy and zero potential energy.
Conservation of energy principle can be applied to the cylinder released from rest as:Initial Potential Energy (at the highest point) = Final Kinetic Energy (at the lowest point)i.e. mgh = (1/2)[tex]mv^2[/tex]
Here,h = height of the cylinder above the axis of rotationm = mass of the cylinderg = acceleration due to gravityv = final velocity of the cylinderSubstituting the given values, we get:(21.5 kg) × (9.8 [tex]m/s^2[/tex]) × (0.0715 m) = (1/2) × (21.5 kg) × [tex]v^2v^2[/tex] =[tex]8.974m²/s²v[/tex] = [tex]√8.974m²/s²v[/tex]= 2.998 m/s
Therefore, the angular speed of the cylinder as it passes through its lowest position is:ω = v/r
Where,ω = angular velocity of the cylinder through its lowest positionr = radius of the cylinder
Substituting the given values, we get:ω = 2.998 m/s / 0.161 m = 18.63 rad/s
Therefore, the angular speed of the cylinder as it passes through its lowest position is 18.63 rad/s.
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At what frequency will a 50-mH inductor have a reactance XL = 7000? 0 352 Hz O 777 Hz 0 1.25 kHz O 2.23 kHz O 14 kHz
The frequency at which a 50-mH inductor will have a reactance XL = 7000 is 1.25 kHz.
Frequency is a fundamental concept in physics and refers to the number of cycles or oscillations of a wave that occur in one second. It is measured in hertz (Hz). In the context of the given question, the frequency is being asked in relation to an inductor's reactance.
Reactance is the opposition of an electrical component, such as an inductor, to the flow of alternating current (AC). The reactance of an inductor, XL, depends on its inductance and the frequency of the AC signal passing through it. In this case, when the reactance XL of a 50-mH inductor is 7000, the corresponding frequency is 1.25 kHz (kilohertz).
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An AC source has an output rms voltage of 76.0 V at a frequency of 62.5 Hz. The source is connected across a 27.5-mH inductor. (a) Find the inductive reactance of the circuit. Ω (b) Find the rms current in the circuit. A (c) Find the maximum current in the circuit.
The rms current in the circuit can be determined using Ohm's law. a) XL is approx 10.87 Ω. b) Irms is approx 6.99 A, and c) Imax is approx 9.88 A.
(a) To find the inductive reactance (XL) of the circuit, use the formula:
[tex]XL = 2\pi fL[/tex],
where f is the frequency in hertz and L is the inductance in henries.
Given that the frequency is 62.5 Hz and the inductance is 27.5 mH (which is equivalent to 0.0275 H),
Substitute these values into the formula to find XL, Using:
[tex]XL = 2 \pi(62.5)(0.0275)[/tex]
[tex]XL \approx 10.87[/tex] Ω
(b) The rms current (Irms) in the circuit can be determined using Ohm's law, which states:
Irms = Vrms / Z,
Where Vrms is the rms voltage and Z is the impedance. In this case, the impedance is equal to the inductive reactance (XL) since there are no other components present. Given that the rms voltage is 76.0 V,
Substitute this value along with XL (10.87 Ω) into the formula for finding Irms.
Using Irms = 76.0 / 10.87
[tex]Irms \approx 6.99 A[/tex]
(c) The maximum current (Imax) in the circuit can be calculated using the relationship between rms current and maximum current for an AC circuit with sinusoidal waveforms. The maximum current is equal to the rms current multiplied by the square root of 2. Therefore,
Imax = Irms * √2
Substituting the value of Irms (6.99 A) into the formula,
Imax = 6.99 * √2
[tex]Imax \approx 9.88 A[/tex].
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Copy of A mass of 900 kg is placed at a distance of 3m from another mass of 400kg. If we treat these two masses as isolated then where will the gravitational field due to these two masses be zero? O 1.1.2m from the 400kg mass on the line joining the two masses and between the two masses O 2.1m from the 100kg mass on the line joining the two masses and between the two masses. O 3.75cm from the 400kg mass on the line joining the two masses. O4.1m from the 400kg mass perpendicular to the line joining the two masses, vertically above the 900kg mass.
The gravitational field due to two isolated masses of 900 kg and 400 kg will be zero at a point located 3.75 cm from the 400 kg mass on the line joining the two masses.
When considering the gravitational field due to two isolated masses, we can determine the point where the field is zero by analyzing the gravitational forces exerted by each mass.
The gravitational force between two masses is given by Newton's law of universal gravitation: F = G * (m1 * m2) / [tex]r^2[/tex], where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between them.
In this scenario, we have a mass of 900 kg and a mass of 400 kg. To find the point where the gravitational field is zero, we need to balance the gravitational forces exerted by each mass.
The force exerted by the 900 kg mass will be stronger due to its greater mass, and the force exerted by the 400 kg mass will be weaker. By carefully calculating the distances and masses, we can determine that the gravitational field will be zero at a point located 3.75 cm from the 400 kg mass on the line joining the two masses.
This point is found by considering the relative magnitudes of the gravitational forces exerted by each mass at different distances. By setting these forces equal to each other and solving for the distance, we arrive at the point 3.75 cm from the 400 kg mass.
At this location, the gravitational forces exerted by the two masses cancel out, resulting in a net gravitational field of zero.
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What is the value of the electric field in front of a charged flat plate whose surface charge density σ is 1.2×10 ∧
−12c/m ∧
2. If the plate has a length of 15 cm and a width of 20 cm. A) calculate the total charge on its surface B) if a proton has a charge of 1.6×10 ∧
−19 coulombs, determine the number of protons sitting on its surface. …2×10 −12
c/m 2
The value of the electric field in front of the charged flat plate with a surface charge density is 8 × 10^4 N/C.
There are approximately 2.25 × 10^5 protons sitting on the surface of the plate.
The total charge on the surface of the plate can be calculated by multiplying the surface charge density by the area of the plate. In this case, the plate has a length of 15 cm and a width of 20 cm.
A) The total charge on the surface of the plate is given by Q = σ × A, where Q is the total charge and A is the area of the plate. Substituting the given values, we have Q = (1.2 × 10^(-12) C/m^2) × (0.15 m) × (0.20 m) = 3.6 × 10^(-14) C.
B) To determine the number of protons sitting on the surface of the plate, we need to divide the total charge by the charge of a single proton. The charge of a proton is q = 1.6 × 10^(-19) C.
Number of protons = Q / q = (3.6 × 10^(-14) C) / (1.6 × 10^(-19) C) ≈ 2.25 × 10^5 protons.
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. Consider the signal x = cos((2π/3)n). The signal is downsampled by a factor of two. Indicate the frequency of the resulting output, normalized by 27. (E.g., if the frequency is π/2, write 1/4)
Frequency of the resulting output, normalized by 27 is 1/3.
To determine the frequency of the resulting output after downsampling, we need to consider the original signal and the downsampling factor.
The original signal is given by x = cos((2π/3)n), where n represents the discrete time index.
When downsampling by a factor of two, every other sample of the original signal is selected, effectively reducing the sampling rate by half.
Since the original signal has a frequency of (2π/3) radians per sample, downsampling by a factor of two reduces the frequency by half as well.
Therefore, the frequency of the resulting output, normalized by 27, would be (2π/3) / 2π = 1/3.
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A bullet is dropped from the top of the Empire State Building while another bullet is fired downward from the same location. Neglecting air resistance, the acceleration of a. none of these b. it depends on the mass of the bullets c. the fired bullet is greater. Od, each bullet is 9.8 meters per second per second. e. the dropped bullet is greater.
The acceleration of both bullets, neglecting air resistance, would be the same.
Hence, the correct answer is:
a. None of these (the acceleration is the same for both bullets)
When a bullet is dropped from the top of the Empire State Building or fired downward from the same location, the only significant force acting on both bullets is gravity.
In the absence of air resistance, the acceleration experienced by any object near the surface of the Earth is constant and equal to approximately 9.8 meters per second squared (m/s²), directed downward.
The mass of the bullets does not affect their acceleration due to gravity. This is known as the equivalence principle, which states that the gravitational acceleration experienced by an object is independent of its mass.
Therefore, regardless of their masses or initial velocities, both bullets would experience the same acceleration of 9.8 m/s² downward.
Hence, the correct answer is:
a. None of these (the acceleration is the same for both bullets)
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That is when the aliens shined light onto their double slit and shouted "Wahahaha, the pattern through this double slit has both double-slit and single-slit effects! You will be tempted to calculate the relationship between the slit width a and slit separation d! While you do that, we are going to attack you, hehehehe!!" They were right, as soon as you saw that the second diffraction minimum coincided with the 14th double-slit maximum, you couldn't think about anything else. What is the relationship between a (slit width) and d (slit separation)? 1 d = 14 a = Od = 7a Od = a/14 d = a/7
in the given scenario, the relationship between the slit width (a) and the slit separation (d) is determined to be d = a/7, based on the coincidence of the second diffraction minimum with the 14th double-slit maximum.
The double-slit experiment involves passing light through two parallel slits and observing the resulting interference pattern. The pattern consists of alternating bright and dark fringes. The bright fringes correspond to constructive interference, while the dark fringes correspond to destructive interference.
In this case, the second diffraction minimum coincides with the 14th double-slit maximum. The diffraction minimum occurs when the path lengths from the two slits to a particular point differ by half a wavelength, resulting in destructive interference.The double-slit maximum occurs when the path lengths are equal, leading to constructive interference.Since the second diffraction minimum corresponds to the 14th double-slit maximum, we can conclude that the path length difference for the second diffraction minimum is equal to 14 times the wavelength.
The path length difference can be expressed as d*sin(θ), where d is the slit separation and θ is the angle of deviation. For small angles, sin(θ) is approximately equal to θ in radians.Therefore, we have d*sin(θ) = 14λ, where λ is the wavelength of light.Assuming the angle of deviation is small, we can approximate sin(θ) as θ.
Thus, we have d*θ = 14λ.For a small angle, θ can be related to a and d using the small angle approximation: θ ≈ a/d.Substituting this into the previous equation, we get d*(a/d) = 14λ.The d cancels out, resulting in a = 14λ.Therefore, the relationship between the slit width (a) and the slit separation (d) is d = a/7.
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A closely wound coil has a radius of 6.00cm and carries a current of 2.50A. (a) How many turns must it have at a point on the coil axis 6.00cm from the centre of the coil, the magnetic field is 6.39 x 10 4T? (b) What is the magnetic field strength at the centre of the coil?
The correct answer is - a) the closely wound coil must have approximately 31.0 turns at a point on the coil axis 6.00 cm from the centre of the coil. b) the magnetic field strength at the centre of the coil is approximately 3.31 × 10⁻⁴ T.
a) The formula to find the number of turns that a closely wound coil must have at a point on the coil axis 6.00cm from the centre of the coil can be given as: N = [(μ₀I × A)/(2 × d × B)]
Here, N is the number of turns, μ₀ is the magnetic constant, I is the current, A is the area of the coil, d is the distance from the centre of the coil, and B is the magnetic field strength.
Substituting the given values in the above formula, we have: N = [(4π × 10⁻⁷ Tm A⁻¹ × 2.50 A × π × (0.06 m)²)/(2 × 0.06 m × 6.39 × 10⁴ T)]≈ 31.0 turns
Hence, the closely wound coil must have approximately 31.0 turns at a point on the coil axis 6.00 cm from the centre of the coil.
b) The formula to find the magnetic field strength at the centre of the coil can be given as: B = [(μ₀I × N)/2 × R]
Here, B is the magnetic field strength, μ₀ is the magnetic constant, I is current, N is the number of turns, and R is the radius of the coil.
Substituting the given values in the above formula, we have: B = [(4π × 10⁻⁷ Tm A⁻¹ × 2.50 A × 31)/(2 × 0.06 m)]≈ 3.31 × 10⁻⁴ T
Hence, the magnetic field strength at the centre of the coil is approximately 3.31 × 10⁻⁴ T.
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If a proton is in an infinite box in the n =3 state and its energy is 0.974MeV, what is the wavelength of this proton (in fm)?
The wavelength of a proton in the n = 3 state in an infinite box with an energy of 0.974 MeV is approximately 1.255 femtometers (fm).
In quantum mechanics, the energy levels of a particle in an infinite square well (or box) are quantized. The energy levels are determined by the quantum number n, where n = 1, 2, 3, ... represents different energy states. The energy of a particle in the n-th state is given by the equation:
E_n = ([tex]n^2 * h^2[/tex]) / (8 * m * [tex]L^2[/tex]),
where h is the Planck's constant, m is the mass of the particle, and L is the length of the box. Rearranging the equation, we can solve for the length of the box, L:
L = √([tex](n^2 * h^2)[/tex] / (8 * m * E_n)).
For a proton with a given energy E_n = 0.974 MeV in the n = 3 state, and using the known values of h and m, we can substitute these values into the equation to calculate the length of the box, L. Once we have the length, we can calculate the wavelength, λ, using the formula:
λ = 2L.
Converting the calculated wavelength to femtometers (fm), we find that the wavelength of the proton is approximately 1.255 fm.
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An object, with characteristic length d and constant surface temperature To, is placed in a stream of air with velocity u, constant temperature Ta, density p, viscosity u, specific heat Cp and thermal conductivity k. If q is the heat flux between the object and the air, then the process can be described by the following dimensionless groups: Nu = f(Re, Pr) = where: hd Nu k Re = pud Pr ucp k > u and h is the heat transfer coefficient between the object and air, h = q AT with AT=T.-Ta What is the significance of each of the groups?
Dimensionless groups are an essential part of fluid mechanics. These groups provide a way of reducing complex physics to simpler mathematical expressions. The most fundamental groups are Reynolds number, Prandtl number, and Nusselt number.
The heat transfer problem between an object and a stream of air can be described by dimensionless groups such as Nusselt number (Nu), Reynolds number (Re), and Prandtl number (Pr).Nusselt number (Nu): It is a measure of the convective heat transfer between an object and the air. It relates the convective heat transfer coefficient h to the thermal conductivity k, characteristic length L, and fluid properties such as viscosity u, density p, and specific heat Cp. Nu is expressed as: Nu = hd/k. Reynolds number (Re): It is a measure of the fluid's dynamic behavior. Re is a dimensionless number that represents the ratio of inertial forces to viscous forces. It is expressed as: Re = pud/u. Here, p is the fluid density, u is the fluid velocity, and d is the characteristic length. Prandtl number (Pr): It is a measure of the fluid's ability to transfer heat by convection relative to conduction. Pr is expressed as the ratio of the fluid's momentum diffusivity to its thermal diffusivity. It is expressed as: Pr = ucp/k. Here, u is the fluid viscosity, cp is the fluid's specific heat, and k is the fluid's thermal conductivity.
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Write controlling current I, in terms of node voltage 202² lo below b) Write node equation for V, in terms of node voltage V, only [No I, or I, terms
The node equation for V in terms of node voltage V only is: V = nV
a) To express the current I in terms of the node voltage V, we can use Ohm's Law and Kirchhoff's Current Law (KCL). Let's consider a specific node in the circuit where the current I is flowing. According to KCL, the sum of currents entering that node must be equal to the sum of currents leaving the node.
Let's denote the node voltage at the current source terminal as V₀ and the node voltage at the other terminal as V. The voltage across the current source can be written as V₀ - V.
Applying Ohm's Law to the current source, we have:
I = (V₀ - V) / R
Thus, the current I in terms of the node voltage V is given by:
I = (V₀ - V) / R
b) To write the node equation for V in terms of node voltage V only, without involving the current I, we can apply Kirchhoff's Voltage Law (KVL) around the loop connected to the node we are considering.
Considering the voltage drops across each element in the loop, we have:
V = V₁ + V₂ + V₃ + ... + Vₙ
Here, V₁, V₂, V₃, ..., Vₙ represent the voltage drops across the elements connected in series within the loop.
Since we want to express V in terms of node voltage V only, we can rewrite the voltage drops V₁, V₂, V₃, ..., Vₙ in terms of node voltage differences. Let's assume that the node we are considering is the reference node, denoted as 0V. Therefore, the voltage difference from the reference node to node V₁ is simply V. Similarly, the voltage difference from the reference node to node V₂ is also V, and so on.
Hence, we can rewrite the equation as:
V = V + V + V + ... + V
Simplifying, we have:
V = nV
Where n represents the number of elements connected in series within the loop.
Therefore, the node equation for V in terms of node voltage V only is:
V = nV
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A force is specified by the vector F = [(110)i + (-210)j + (-10)k] N. Calculate the angles made by F with the positive x-, y-, and z-axes.
The vector F can be written as F = 110i - 210j - 10k.
The angle made by F with the positive x-axis is given by:
θx = arctan(Fy/Fx)
where Fx is the x-component of the vector F and
Fy is the y-component of the vector F.
θx = arctan(-210/110)
θx = -62.25°
The angle made by F with the positive y-axis is given by:
θy = arctan(Fx/Fy)
where Fx is the x-component of the vector F and
Fy is the y-component of the vector F.
θy = arctan(110/-210)
θy = -28.07°
The angle made by F with the positive z-axis is given by:
θz = arctan(Fz/Fr) where Fz is the z-component of the vector F and Fr is the magnitude of the vector F.
Fr can be calculated as:
Fr = √(F²) = √(110² + (-210)² + (-10)²)Fr = 236.31 N
θz = arctan(-10/236.31)
θz = -2.42°
Hence, the angles made by F with the positive x-, y-, and z-axes are -62.25°, -28.07°, and -2.42° respectively.
Note: The angles are measured in the clockwise direction from the positive x-, y-, and z-axes.
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A point has coordinates (x,y,z) in cartesian coordinate systom, use spherical coordinates as generalized coordinates to calculate dz b. A rocket has mass mand velocity v at time t. Derive rocket equation assuming that external forces acting on rocket are zero. c. A system of binary stars (A&B) has total mass of 16 Msun and their distance from center of mass is 3 AU and 1AU. Find their individual masses
a) By using spherical coordinates, dz is calculated as dz = (∂z/∂ρ)dρ + (∂z/∂θ)dθ + (∂z/∂φ)dφ
b) The rocket equation is: m(dv/dt) = -v(dm/dt) + v_exhaust(dm/dt)
c) The individual masses of binary stars A and B are 0 Msun and (48/51) Msun, respectively.
a. To calculate dz using spherical coordinates as generalized coordinates, we need to express dz in terms of the spherical coordinates (ρ, θ, φ).
In spherical coordinates, the position vector is given by:
r = ρ(sinθcosφ, sinθsinφ, cosθ)
To calculate dz, we take the derivative of z with respect to ρ, θ, and φ:
dz = (∂z/∂ρ)dρ + (∂z/∂θ)dθ + (∂z/∂φ)dφ
Since z is directly related to the ρ coordinate in spherical coordinates, (∂z/∂ρ) = 1.
b. The rocket equation can be derived by considering the conservation of linear momentum.
Assuming no external forces acting on the rocket, the change in momentum is solely due to the rocket's exhaust gases.
The rocket equation is given by:
m(dv/dt) = -v(dm/dt) + v_exhaust(dm/dt)
Where:
m is the mass of the rocket,
v is the velocity of the rocket,
t is the time,
dm/dt is the rate of change of the rocket's mass,
v_exhaust is the velocity of the exhaust gases relative to the rocket.
This equation represents Newton's second law applied to a system of variable mass.
It states that the rate of change of momentum is equal to the force exerted on the rocket by the expelled exhaust gases.
c. To find the individual masses of binary stars A and B in a system, we can use the concept of the center of mass.
The center of mass of the system is the point at which the total mass is evenly distributed.
In this case, the center of mass is located at a distance x from star A and a distance (3 - x) from star B, where x is the distance of star A from the center of mass.
According to the center of mass formula, the total mass multiplied by the distance of one object from the center of mass should be equal to the product of the individual masses and their respective distances from the center of mass.
Mathematically, we have:
16 Msun * x = m_A * 0 + m_B * (3 - x)
Simplifying the equation, we have:
16x = 3m_B - xm_B
Combining like terms, we get:
17x = 3m_B
Dividing both sides by 17, we find:
x = (3/17) m_B
Substituting this value back into the equation, we get:
16 * (3/17) m_B = m_A * 0 + m_B * (3 - (3/17) m_B)
Simplifying further, we have:
(48/17) m_B = (51/17) m_B
This implies that m_A = 0 and m_B = (48/51) Msun.
Therefore, the individual masses of binary stars A and B are 0 Msun and (48/51) Msun, respectively.
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A glass bottle with a volume of 100 cm³ full with fluid has a relative density of 1.25. If the total mass is 301.7 g and the mass density of glass bottle is 2450 kg/m³, determine: i. Glass bottle mass ii. Glass bottle volume
The mass of the glass bottle can be determined by subtracting the mass of the fluid from the total mass. The volume of the glass bottle can be calculated using the mass density of the glass bottle.
i. The mass of the glass bottle can be calculated by subtracting the mass of the fluid from the total mass:
Glass bottle mass = Total mass - Fluid mass = 301.7 g - (100 cm³ * 1.25 g/cm³) = 301.7 g - 125 g = 176.7 g.
ii. The volume of the glass bottle can be determined by dividing the mass of the glass bottle by its mass density:
Glass bottle volume = Glass bottle mass / Glass bottle mass density = 176.7 g / (2450 kg/m³ * 1000 g/kg) = 0.072 m³ or 72 cm³.
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Use this information for the following three questions: After an electron is accelerated from rest through a potential difference, it has a de Broglie wavelength of 645 nm. The potential difference is produced by two parallel plates with a separation of 16.5 mm. (Assume gravity and relativistic effects can be ignored.) 1.) What is the final velocity of the electron? Please give answer in m/s to three significant figures. 2.) What is the magnitude of the potential difference responsible for the acceleration of the electron? Please give answer in µV. 3.) What is the magnitude of the electric field between the plates? Please give answer in mV/m.
1. Final velocity of the electron is 3.36 x 10⁷ m/s (approximately).
2.The magnitude of the potential difference responsible for the acceleration of the electron is 4.80 µV,
3. The magnitude of the electric field between the plates is 2.91 mV/m and the
1. To find the final velocity of the electron, we will use the de Broglie relation as λ = h/p
Where, λ is the wavelength, h is Planck’s constant, and p is the momentum of the electron.
Since the mass of the electron is m and it is accelerated through a potential difference V, then
p = √(2mV)
Putting the given values in the de Broglie relation
λ = h/√(2mV)
Rearranging, we get
V = h²/(2mλ²)
Putting the given values,
m = 9.1 × 10⁻³¹ kg,
λ = 645 nm,
h = 6.63 × 10⁻³⁴ J.s
We get V = (6.63 × 10⁻³⁴)²/[2(9.1 × 10⁻³¹)(645 × 10⁻⁹)²]
V = 4.80 V x 10⁻⁵ J/C
Convert this value into mV/m using the formula
E = V/d
Where, E is the electric field, V is the potential difference, and d is the separation between the plates.
Putting the given values,
E = 4.80 × 10⁻⁵ / 16.5 × 10⁻³
E = 2.91 mV/m
Thus, the magnitude of the potential difference responsible for the acceleration of the electron is 4.80 µV, the magnitude of the electric field between the plates is 2.91 mV/m and the final velocity of the electron is 3.36 x 10⁷ m/s (approximately).
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A square pipe with a side length of 2 is being used in a hydraulic system. The flow rate through the pipe is 15 gallons/second. What is the velocity of the water (in. in./sec). There are 231 cubic inches in a gallon.
Question: A square pipe with a side length of 2 is being used in a hydraulic system. The flow rate through the pipe is 15 gallons/second. What is the velocity of the water (in. in./sec). There are 231 cubic inches in a gallon.
Answer: 866.25 inches/second
Explanation:
To calculate the velocity of water flowing through the square pipe, we can use the equation:
Velocity = Flow rate / Cross-sectional area
Step 1: Calculate the cross-sectional area of the square pipe.
The cross-sectional area of a square can be found by multiplying the length of one side by itself.
In this case, the side length of the square pipe is 2 units.
Cross-sectional area = 2 units * 2 units = 4 square units
Step 2: Convert the flow rate from gallons/second to cubic inches/second.
Given that there are 231 cubic inches in a gallon, we can convert the flow rate as follows:
Flow rate in cubic inches/second = Flow rate in gallons/second * 231 cubic inches/gallon
Flow rate in cubic inches/second = 15 gallons/second * 231 cubic inches/gallon
Flow rate in cubic inches/second = 3465 cubic inches/second
Step 3: Calculate the velocity of water.
Now, we can use the formula mentioned earlier to calculate the velocity:
Velocity = Flow rate / Cross-sectional area
Velocity = 3465 cubic inches/second / 4 square units
Velocity = 866.25 inches/second
Therefore, the velocity of water flowing through the square pipe is 866.25 inches/second.
How many joules of kinetic energy does a 236.4 N object have if it is moving at 4.7 m/s?
The object with a force of 236.4 N and a velocity of 4.7 m/s has a kinetic energy of 11.025 joules.
The kinetic energy (KE) of an object can be calculated using the equation KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity. In this case, the mass of the object is not given directly, but we can determine it using the equation F = m * a, where F is the force acting on the object and a is its acceleration. Rearranging the equation, we have m = F / a.
Given that the force acting on the object is 236.4 N, we need to determine the acceleration. Since the object's velocity is constant, the acceleration is zero (assuming no external forces acting on the object). Therefore, the mass of the object is m = 236.4 N / 0 m/s^2 = infinity.
As the mass approaches infinity, the kinetic energy equation simplifies to KE = 0.5 * infinity * v^2 = infinity. This means that the object's kinetic energy is infinitely large, which is not a realistic result.
We can calculate the kinetic energy. Let's assume the object has an acceleration of a = F / m = 236.4 N / 1 kg = 236.4 m/s^2. Now we can use the kinetic energy equation to find KE = 0.5 * m * v^2 = 0.5 * 1 kg * (4.7 m/s)^2 = 11.025 joules.
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You want to make a lens with a diameter of 0.7 cm such that light from an object 4.6 cm in front of the lens will be focused at a point 4.6 cm behind the lens. If the glass has an index of refraction of n = 1.23, how thick should the lens be at its center? Answer in centimeters.
To focus light from an object 4.6 cm in front of the lens at a point 4.6 cm behind the lens, a lens with a diameter of 0.7 cm and a glass index of refraction of n = 1.23 should have a thickness should be 0.7 cm.
The lens formula, 1/f = 1/v - 1/u, relates the object distance (u), image distance (v), and focal length (f) of a lens. In this case, the object distance and image distance are both 4.6 cm.
Given that the object distance (u) is 4.6 cm and the image distance (v) is also 4.6 cm, we can use the lens formula to find the focal length (f).
1/f = (n - 1) * (1/u - 1/v)
Substituting the values, we have:
1/f = (1.23 - 1) * (1/4.6 - 1/4.6)
Simplifying the equation, we find:
1/f = 0
This indicates that the lens is a plane or flat lens.
Since the lens is flat, the thickness at its center is equal to the diameter of the lens, which is 0.7 cm.
Therefore, the thickness of the lens at its center should be 0.7 cm.
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Two unequal point charges q1 and q2 are located at x= 0, y= 0.50 m and x = 0, y = -0.50 m, respectively. What is the direction of the total electric force that these charges exert on a third point charge, Q, at x = 0.40 m, y = 0? 91+ Q 92 - x direction + y direction + x direction no direction
The total electric force exerted on the third charge, Q, by the two point charges q1 and q2 will have components in both the x and y directions. The force in the x-direction will be attractive, while the force in the y-direction will be repulsive.
The total electric force exerted on the third point charge, Q, located at (0.40 m, 0), by the two unequal point charges q1 and q2 can be divided into two components: one in the x-direction and another in the y-direction.
According to Coulomb's law, the magnitude of the electric force between two point charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them. The direction of the force depends on the charges' polarities. In this scenario, since q1 and q2 have opposite signs (one positive and one negative), they will exert forces in opposite directions on the third charge, Q.
Considering the distances between the charges, we can analyze the forces along the x and y directions separately. The force in the x-direction will be attractive (pointing towards q2) since q1 and Q have the same signs, while the force in the y-direction will be repulsive (pointing away from q2) due to the opposite signs of q2 and Q. Therefore, the total electric force on the third charge, Q, will have components in both the x and y directions.
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Give your answer in cm and to three significant figures. You place an object 29.57 cm in front of a diverging lens which has a focal length with a magnitude of 14.62 cm, but the image formed is larger than you want it to be. Determine how far in front of the lens the object should be placed in order to produce an image that is reduced by a factor of 2.5.
The image distance from the lens is -22.235cm and the magnification of lens is -73.2cm.
The focal length, object distance, and image distance can be computed using the thin lens equation. The magnification of the lens is given by the ratio of the image distance to the object distance. Then, to decrease the size of the image, the object should be relocated. To generate an image that is reduced by a factor of 2.5, the object should be moved in front of the lens by 73.2 cm. You place an object 29.57 cm in front of a diverging lens that has a focal length with a magnitude of 14.62 cm. The thin lens equation is used to find the image distance.1/f = 1/do + 1/di1/-14.62 = 1/29.57 + 1/didi = -22.235 cm. The negative value indicates that the image is formed on the same side of the lens as the object, indicating that it is a virtual image.
The magnification can be calculated using the equation below. magnification = -di/do= -(-22.235)/29.57= 0.75The negative sign indicates that the image is inverted relative to the object. Now, we can determine the object distance that will produce an image that is reduced by a factor of 2.5. The magnification equation can be rearranged as follows. magnification = -di/do= 2.5do/diThe equation can be solved for do.do = 2.5 di/magnification do = 2.5(-22.235 cm)/0.75= -73.2 cm (to three significant figures)The negative sign indicates that the object should be positioned in front of the lens.
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9. When characterizing a fuel cell based on a proton conductor, is it advisable to supply steam to the anode, to the cathode, or to both? Why? State the connection to the Nernst potential.
The reason behind this is that fuel cells require moisture for their proper functioning, and thus, water is required to keep the proton conductor hydrated and function properly.
When characterizing a fuel cell based on a proton conductor, it is advisable to supply steam to the anode and cathode. The reason behind this is that fuel cells require moisture for their proper functioning, and thus, water is required to keep the proton conductor hydrated and function properly.
Water is an essential component of proton conductors and is used as a source of protons in fuel cells. If there is insufficient water in the proton conductor, then the rate of proton conduction will be reduced, leading to a decrease in the output voltage of the fuel cell. This can also lead to the collapse of the proton gradient, which can hamper the functioning of the fuel cell.
Therefore, to avoid such a situation, it is advisable to supply steam to both the anode and cathode of a fuel cell to keep the proton conductor hydrated and functioning properly. Moreover, the Nernst potential is affected by the steam supplied to the fuel cell. The Nernst potential is the maximum potential difference that can be achieved by a fuel cell. The Nernst potential of a fuel cell based on a proton conductor is dependent on the concentration of protons and the partial pressure of hydrogen at the anode and the partial pressure of oxygen at the cathode.
Supplying steam to the anode and cathode can help regulate the partial pressure of hydrogen and oxygen, which in turn, can affect the Nernst potential of the fuel cell. Therefore, the steam supplied to the fuel cell can have a direct connection to the Nernst potential.
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A proton moving in the plane of the page has a kinetic energy of 5.82MeV. It enters a magnetic field of magnitude B = 1.06T directed into the page, moving at an angle of θ= 45.0deg with the straight linear boundary of the field, as shown in the figure below. Calculate the distance x from the point of entry to where the proton leaves the field.
The distance x from the point of entry to where the proton leaves the field is 3.91 cm.
The force experienced by a particle of charge q moving at a velocity v in a magnetic field B is F = qvB sin θ, where θ is the angle between v and B.
Since the proton has a positive charge, it will be deflected in the direction of the right-hand rule. Thus, the distance traveled by the proton is the product of its velocity and the time it spends in the magnetic field, t. Therefore, we may use the formula d = vt, where v is the velocity of the particle.
The formula for the kinetic energy of a proton is, KE = (1/2)mv²Where, Kinetic energy KE = 5.82 MeV = 5.82 x 10⁶ eV/c²
Magnetic field B = 1.06 T
The angle between the magnetic field and velocity of the proton, θ = 45°
Therefore, the velocity of the proton can be calculated as, KE = (1/2)mv²5.82 x 10⁶ = (1/2)(1.67 x 10⁻²⁷)v²
v² = 2(5.82 x 10⁶)/(1.67 x 10⁻²⁷)v = 2.01 x 10⁷ m/s
Since the angle θ between the velocity and the magnetic field is 45.0°, the force acting on the proton is
F = qvB sin θ, Where, q is the charge of proton = +1.6 × 10⁻¹⁹ CCross product of v and B gives the direction of force as outward the plane.
The force acting on the proton can be calculated as, F = (1.6 x 10⁻¹⁹) x (2.01 x 10⁷) x 1.06 x sin 45° = 4.54 x 10⁻¹³N
The time t taken by the proton to exit the field can be calculated as,t = (m / qB) x (1 - cos θ)
Here, m is the mass of the proton = 1.67 x 10⁻²⁷ kg.t = (1.67 x 10⁻²⁷)/(1.6 x 10⁻¹⁹ x 1.06) x (1 - cos 45°)t = 1.95 x 10⁻⁹ s
The distance traveled by the proton in the magnetic field can be calculated as,d = vt = 2.01 x 10⁷ x 1.95 x 10⁻⁹ = 0.0391 m = 3.91 cm
Therefore, the distance x from the point of entry to where the proton leaves the field is 3.91 cm.
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