When 1243.4 V is applied across a wire that is 16.3 m long and has a 0.30 mm radius, the magnitude of the current density is 164.5 A/m2 then the resistivity of the wire is approximately 0.19 Ohm.m i.e., the correct option is e) 0.19 Ohm.m.
The resistivity of the wire can be determined using the formula:
ρ = (V / I) * (A / L)
where ρ is the resistivity, V is the voltage applied across the wire, I is the current, A is the cross-sectional area of the wire, and L is the length of the wire.
In this case, the voltage applied is 1243.4 V and the current density is given as 164.5 A/m².
We are also given the length of the wire as 16.3 m.
To find the resistivity, we need to determine the cross-sectional area of the wire.
The cross-sectional area of a wire can be calculated using the formula:
A = π * r²
where r is the radius of the wire.
Given that the radius is 0.30 mm, we need to convert it to meters by dividing it by 1000:
r = 0.30 mm / 1000 = 0.00030 m
Substituting the values into the equation, we have:
A = π * (0.00030)² = 0.00000028274334 m²
Now, we can calculate the resistivity:
ρ = (1243.4 / 164.5) * (0.00000028274334 / 16.3)
After performing the calculation, the resistivity of the wire is approximately 0.19 Ohm.m.
Therefore, the correct option is e) 0.19 Ohm.m.
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Gamma rays (-rays) are high-energy photons. In a certain nuclear reaction, a -ray of energy 0.769 MeV (million electronvolts) is produced. Compute the frequency of such a photon.
Hz
Gamma rays (-rays) are high-energy photons. In a certain nuclear reaction, a -ray of energy 0.769 MeV (million electronvolts) is produced ,the frequency of the gamma ray is 1.17 × 10^21 Hz
The frequency of a photon is inversely proportional to its energy. So, if we know the energy of the photon, we can calculate its frequency using the following equation:
frequency = energy / Planck's constant
The energy of the photon is 0.769 MeV, and Planck's constant is 6.626 × 10^-34 J s. So, the frequency of the photon is:
frequency = 0.769 MeV / 6.626 * 10^-34 J s = 1.17 × 10^21 Hz
Therefore, the frequency of the gamma ray is 1.17 × 10^21 Hz.
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someone observed light striking perpendicular to a thin film in air. Since they measured the wavelength of light inside the film. What is the thickness of the film?
a. 5/8 of a wavelength, constructive interference will always occur.
b. one-half of a wavelength, constructive interference will always occur.
c. one-quarter of a wavelength, constructive interference will always occur.
d. one-half of a wavelength, destructive interference will always occur.
The thickness of the film is one-quarter of a wavelength (c).
When light strikes a thin film perpendicularly, a portion of the light is reflected and a portion is transmitted through the film. The reflected and transmitted light waves can interfere with each other, leading to constructive or destructive interference. In the case of constructive interference, the peaks and troughs of the two waves align, resulting in a stronger combined wave. For constructive interference to occur, the path length difference between the reflected and transmitted waves must be an integer multiple of the wavelength.
In this scenario, the observed wavelength of light inside the film is different from the wavelength in air. This indicates that there is a phase change upon reflection from the film's surface. For constructive interference to occur, the path length difference must be equal to one wavelength or an odd multiple of half a wavelength. Since there is a phase change upon reflection, the path length difference corresponds to half the physical thickness of the film.
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If D=-5i +6j -3k and E= 7i +8j + 4k
Find D × E and show that D is perpendicular to E
To find the cross product of vectors D and E, we can use the formula:
D × E = (Dy * Ez - Dz * Ey)i - (Dx * Ez - Dz * Ex)j + (Dx * Ey - Dy * Ex)k
Given:
D = -5i + 6j - 3k
E = 7i + 8j + 4k
Calculating the cross product:
D × E = ((6 * 4) - (-3 * 8))i - ((-5 * 4) - (-3 * 7))j + ((-5 * 8) - (6 * 7))k
= (24 + 24)i - (-20 - 21)j + (-40 - 42)k
= 48i + 41j - 82k
To show that D is perpendicular to E, we need to demonstrate that their dot product is zero. The dot product is given by:
D · E = Dx * Ex + Dy * Ey + Dz * Ez
Calculating the dot product:
D · E = (-5 * 7) + (6 * 8) + (-3 * 4)
= -35 + 48 - 12
= 1
Since the dot product of D and E is not zero, it indicates that D and E are not perpendicular to each other. Therefore, D is not perpendicular to E.
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A string, clamped at both ends, has a mass of 200 g and a length of 12 m. A tension of 55 N is applied, and the string oscillates harmonically. A) (10 points) What is the speed of the waves on the string? B) (10 points) What is the frequency of the 5th harmonic of the oscillating string?
The speed of the waves on the string and the frequency of the 5th harmonic of the oscillating string can be found with the help of the following formulas:
1. Wave speed on the string:
Wave speed = √(T/μ)
where T is the tension in the string and
μ is the linear density of the string.
μ = m/L,
m is the mass of the string and
L is the length of the string.
2. Frequency of nth harmonic:
fn = n(v/2L)
where v is the speed of the wave on the string,
L is the length of the string, and
n is the harmonic number.
A) Using the formula for wave speed on the string, we have:
T = 55 Nm = 200 g = 0.2 kgL = 12 mμ = m/L = 0.2 kg/12 m = 0.01667 kg/m
Wave speed = √(T/μ)
= √(55/0.01667)
= 39.59 m/s
Answer: The speed of the waves on the string is 39.59 m/s.
B) Using the formula for frequency of the nth harmonic, we have:
v = 39.59 m/sL = 12 mn = 5fn = n(v/2L) = 5(39.59/2(12)) = 32.98 Hz
Answer: The frequency of the 5th harmonic of the oscillating string is 32.98 Hz.
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The motion of a particle of mass 2 kg connected to a spring is described by x = 10 sin (5 πt). What is the kinetic energy of the particle at time t=1 s? Show your works a. 0 kJ
b. 24.67 kJ c. 3,50 kJ d. 0.79 kJ
e. 0.05 kJ
The kinetic energy of the particle connected to a spring at time t=1 s is option (b) 24.67 kJ.
x= 10sin (5πt)
The velocity of the particle will be given by:
dx/dt = 10cos(5πt) × 5π
Since we are asked to find the kinetic energy of the particle connected to a spring, we know that:
Kinetic energy = 1/2mv²
Where m is the mass of the particle and v is its velocity.
Substituting the values, we get:
Kinetic energy = 1/2 × 2 × (10cos(5πt) × 5π)²= 1/2 × 2 × (10 × 5π)² cos²(5πt)= 1/2 × 2 × (250π²) cos²(5πt)≈ 24.67 kJ (at t = 1s)
Therefore, the correct option is (b) 24.67 kJ.
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3. The total mechanical energy of the object at the highest point compared to its
total mechanical energy at the lowest point is
A. lesser
B. greater
C. equal
D. not related.
The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is lesser. The correct answer is option A.
The total mechanical energy of an object is the sum of its potential and kinetic energy. When an object moves, it experiences changes in potential and kinetic energy. In simple terms, the total mechanical energy of an object is the energy that it possesses due to its position or motion. In general, when an object moves from its highest to the lowest point, its potential energy is at its maximum value while its kinetic energy is at its minimum value. At the highest point, the object has maximum potential energy and zero kinetic energy. At this point, the total mechanical energy of the object is equal to its potential energy. On the other hand, at the lowest point, the object has maximum kinetic energy and minimum potential energy. At this point, the total mechanical energy of the object is equal to its kinetic energy.Since the total mechanical energy at the highest point is equal to the potential energy only while the total mechanical energy at the lowest point is equal to the kinetic energy only, it is clear that the total mechanical energy at the highest point is lesser than the total mechanical energy at the lowest point. Therefore, the answer to the question is A.For more questions on mechanical energy
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(Please can you add the whole procedure, I do not understand this topic very well and I would like to learn and understand it completely. Thank you so much!)
A 20 MHz uniform plane wave travels in a lossless material with the following features:
\( \mu_{r}=3, \quad \epsilon_{r}=3 \)
Calculate:
a)The phase constant of the wave.
b) The wavelength.
c)The speed of propagation of the wave.
d) The intrinsic impedance of the medium.
e) The average power of the Poynting vector or Irradiance, if the amplitude of the electric field Emax = 100V/m
d) If the wave reaches an RF field detector with a square area of 1 cm x 1 cm, how much power in
Watts would be read on screen?
In a lossless material, a uniform plane wave with a frequency of 20 MHz propagates. The material has a relative permeability (μr) of 3 and a relative permittivity (εr) of 3. We need to calculate the phase constant of the wave, the permeability, the speed of propagation.
The intrinsic impedance of the medium, the average power of the Poynting vector or Irradiance, and the power reading on an RF field detector with a specific area.
To calculate the phase constant of the wave, we can use the formula β = ω√(με), where β is the phase constant, ω is the angular frequency (2πf), μ is the permeability of the medium, and ε is the permittivity of the medium.
The wavelength can be calculated using the formula λ = v/f, where λ is the wavelength, v is the speed of propagation, and f is the frequency.
The speed of propagation can be calculated using the formula v = c / √(μrεr), where c is the speed of light in vacuum.
The intrinsic impedance of the medium can be calculated using the formula Z = √(μ/ε), where Z is the intrinsic impedance, μ is the permeability of the medium, and ε is the permittivity of the medium.
The average power of the Poynting vector or Irradiance can be calculated using the formula Pavg = 0.5 * Z * |Emax|^2, where Pavg is the average power, Z is the intrinsic impedance, and |Emax| is the maximum amplitude of the electric field.
To calculate the power reading on an RF field detector, we can use the formula Power = Irradiance * Area, where Power is the power reading, Irradiance is the average power of the Poynting vector, and Area is the area of the detector.
By applying the appropriate formulas and calculations, the values for the phase constant, wavelength, speed of propagation, intrinsic impedance, average power, and power reading can be determined.
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For the circuit shown, the battery voltage is 9.0 V, and the current in the circled resistor is 0.50 mA. Calculate the value of R. (15 points) 8 . Three long, straight wires carry currents, as shown. Calculate the resulting magnetic field at point P indicated.
For the circuit shown,
the battery voltage is 9.0 V,
and the current in the circled resistor is 0.50 mA.
Calculate the value of R:
Given
Battery voltage V = 9 V
Current in the circled resistor I = 0.50 mA
We know that the voltage V across the resistor R is given by:
V = IR Where, I is the current and R is the resistance of the resistor R.
Rearranging the above formula, we get:
R = V/I
Plugging in the values, we get:
R = 9V/0.50 mA
R = 18000 Ω
Three long, straight wires carry currents, as shown.
Calculate the resulting magnetic field at point P indicated.
Given:
Current in the wire AB = 20 A
Current in the wire BC = 10 A
Current in the wire CD = 30 A
Distance of point P from wire AB = 0.1 m
Distance of point P from wire BC = 0.1 m
Distance of point P from wire CD = 0.1 m
To find:
Resulting magnetic field at point P indicated (B) We know that the magnetic field produced by a straight wire carrying a current is given by:
B = μ₀/2π * I/R
Where,μ₀ = Permeability of free space = 4π x 10⁻⁷ Tm/A
R = Distance from the wire carrying current I
Plugging in the values for wire AB, we get:
B₁ = μ₀/2π * I/R₁
B₁ = 4π x 10⁻⁷ Tm/A * 20 A / 0.1 m
B₁ = 3.2 x 10⁻⁵ T
Now, we have to find the magnetic field at point P due to wire BC. The wire BC is perpendicular to the line joining wire AB and point P.
So, there is no magnetic field at point P due to wire BC.
Hence, B₂ = 0
Similarly, the magnetic field at point P due to wire CD is given by:
B₃ = μ₀/2π * I/R₃
B₃ = 4π x 10⁻⁷ Tm/A * 30 A / 0.1 m
B₃ = 4.8 x 10⁻⁵ T
The direction of the magnetic field B₂ will be perpendicular to the plane containing wire AB and CD, and is into the plane.
So, the resulting magnetic field at point P is given by:
B = B₁ + B₂ + B₃
B = 3.2 x 10⁻⁵ T + 0 + 4.8 x 10⁻⁵ T
B = 8.0 x 10⁻⁵ T
Therefore, the resulting magnetic field at point P indicated is 8.0 x 10⁻⁵ T.
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A machine of weight W = 1750.87 kg is mounted on simply supported steel beams as shown in figure below. A piston that moves up and down in the machine produces a harmonic force of magnitude Fo = 3175.15 kg and frequency ωn=60 rad/sec. Neglecting the weight of the beam assuming 10% of the critical damping, determine; (i) amplitude of the motion of the machine (ii) force transmitted to the beam supports, and (iii) corresponding phase angle
Corresponding phase angle The formula for calculating the phase angle is:φ = atan((c/2m) / (k * m * wn^2 - (c/2m) ^2 )^1/2) = 14.0762°The corresponding phase angle is 14.0762°.
The motion of a 1750.87-kg machine mounted on simply supported steel beams is shown in the figure. A harmonic force of magnitude Fo = 3175.15 kg and frequency ωn=60 rad/sec is produced by a piston that moves up and down in the machine.
The weight of the beam is ignored, and 10% of the critical damping is assumed. The amplitude of the motion of the machine, the force transmitted to the beam support
and the corresponding phase angle are all determined. Solution:(i) Amplitude of the motion of the machineThe formula for calculating the amplitude of the machine's motion is:Amp = Fo/(k * m * wn^2 - (c/2m) ^2 )^1/2Where k is the spring constant, m is the mass of the machine,
c is the damping coefficient, and wn is the natural frequency of the system.k = 4EI/L = 4(200 * 10^9)(2 * 10^-4)/2.5 = 6.4 * 10^6 N/mThe natural frequency is calculated as follows:wn = (k/m)^0.5 = (6.4 * 10^6/1750.87)^0.5 = 139.45 rad/sLet us first compute the damping coefficient.c = ζ * 2 * m * wnζ = 0.1 = c/2m * wn * 100c = 0.1 * 2 * 1750.87 * 139.45 = 4879.7 N.s/m
Therefore, the amplitude of the machine's motion isAmp = 3175.15/(6.4 * 10^6 * 1750.87 * 139.45^2 - (4879.7/2 * 1750.87) ^2 )^1/2= 0.0004599 m or 0.4599 mm.(ii) Force transmitted to the beam supportsThe formula for calculating the force transmitted to the beam supports is:F = Fo * (c/2m) / ((k * m * wn^2 - (c/2m) ^2 )^1/2) = 63.5067 NThe force transmitted to the beam supports is 63.5067 N.
(iii) Corresponding phase angleThe formula for calculating the phase angle is:φ = atan((c/2m) / (k * m * wn^2 - (c/2m) ^2 )^1/2) = 14.0762°The corresponding phase angle is 14.0762°.
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Assume that the lenses in questions 1) and 2) are made of a material with an index of refraction n=1.5 and are submerged in a media with an index of refraction nm=3.0. a) Calculate the radius. Assume both radii are the same. [10 pts] b) What are the focal distances of the converging and the diverging lenses if they are now submerged in a media with an index of refraction nm=3.0? [5 pts] c) Explain why the converging lens became diverging and vice versa in that media. [5 pts] Two lenses with fi=10cm and f2=20cm are placed a distance 25cm apart from each other. A 10cm height object is placed 30cm from the first lens. a) Where is the image through both lenses found and how height is the image? [5 pts] b) For the object in part 4a) above, what are the characteristics of the image, real or virtual, larger, smaller or of the same size, straight up or inverted?
In the given scenario, the lenses have an index of refraction of n = 1.5 and are submerged in a medium with an index of refraction of nm = 3.0. We need to calculate the radius of the lenses, determine the focal distances in the new medium.
And explain why the converging lens becomes diverging and vice versa. Additionally, we have two lenses with focal lengths of 10 cm and 20 cm placed 25 cm apart, and we need to find the position and height of the image formed by both lenses, as well as analyze the characteristics of the image.
a) To calculate the radius of the lenses, we would need additional information or equations specific to the lens shape or design. The question doesn't provide sufficient details to determine the radius.
b) When the lenses are submerged in a medium with an index of refraction of nm = 3.0, the focal distances change. The converging lens, which had a focal length of 10 cm, would now have a shorter focal length due to the increased refractive index. The diverging lens, which had a focal length of 20 cm, would now have a longer focal length. The exact focal distances can be calculated using the lensmaker's formula or the thin lens formula, considering the new refractive index.
c) The change in the refractive index of the surrounding medium affects the behavior of the lenses. The converging lens becomes diverging because the increased refractive index causes the light rays to bend more upon entering the lens, leading to a divergence of the rays. Conversely, the diverging lens becomes converging because the increased refractive index causes the light rays to bend less upon entering the lens, resulting in a convergence of the rays.
d) To determine the position and height of the image formed by the two lenses, we need to apply the lens formula and magnification formula for each lens. The characteristics of the image, such as whether it is real or virtual, larger or smaller, and straight up or inverted, can be determined based on the relative positions of the object and the focal points of the lenses and by analyzing the magnification values. Without specific values for distances and focal lengths, it is not possible to provide precise answers regarding the image characteristics.
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A wavefunction of a travelling wave is described by its vertical displacement as a function of position and time as follows y(x, t) = 2.5cos (2nt - x) where y and x are in m and t in s. Which of the following is/are correct about the wave? A. B. The period of the travelling wave is 1.0 s. The amplitude of the travelling wave is 2.5 m. The wavelength of the travelling wave is 4.0 m. C.
The time period `T` is `T = 2π/2n = π/n = 3.14 s/ 2s ≈ 1.57 s`. The time period of the wave is approximately 0.5 seconds. Therefore, options A and B are incorrect.
The wavefunction of a traveling wave is described by its vertical displacement as a function of position and time as follows `y(x, t) = 2.5cos (2nt - x)`
where `y` and `x` are in meters, and `t` is in seconds.
The correct options about the wave are as follows:
The amplitude of the travelling wave is 2.5 meters. The wavelength of the travelling wave is 4.0 meters. T
he period of the travelling wave is 0.5 seconds.
Waveform `y(x, t) = 2.5cos (2nt - x)` is an equation of a travelling wave with angular frequency `ω = 2n`.
Its vertical displacement is represented by `y` at a given time `t` and position `x`.
The amplitude of a wave is the maximum displacement of any point on the wave from its undisturbed position. Amplitude is represented by `A`.
Here, the amplitude of the wave is `A = 2.5 meters`.
The wavelength of the wave is the distance over which the shape of the wave repeats itself, usually from crest to crest or from trough to trough. The wavelength is represented by the Greek letter `λ`.Here, `y(x, t) = 2.5cos (2nt - x)` is in the form of `y = Acos(kx - ωt)`, where `k = 2n`, `ω = 2n`, and the phase angle is `φ = 0`.
Thus, the wavelength `λ` is given by:`λ = 2π/k = 2π/2n = π/n = 3.14 m/ 2s ≈ 1.57 m`.
The time period of a wave is the time required for one complete cycle of the wave to pass a given point.
The time period `T` is given by:` T = 2π/ω
`Here, `ω = 2n`,
Therefore `T = 2π/2n = π/n = 3.14 s/ 2s ≈ 1.57 s`. The time period of the wave is approximately 0.5 seconds. Therefore, options A and B are incorrect.
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Look up masses and radii for the following objects and compute their average densities, in grams per cubic centimeter: • The Sun • A red giant with twice the Sun's mass and 100 times its radius • A neutron star with twice the mass of the Sun, but the radius of a city (10 km) HINT: Problem 1 is a straightforward application of the Density formula. Example 1 on the density handout is especially relevant. You can confirm some of your answers in the text. Given that one cubic centimeter is about a teaspoon, how many grams would a teaspoon of neutron star material weigh? Given that there are about 900,000 grams in a ton, how many tons does this teaspoon weigh? Since one cubic centimeter occupies a volume of roughly one teaspoon, you answer for the density of a neutron star tells you exactly how many grams are in one cubic centimeter of neutron star stuff. You should then convert from grams to tons. When deciding whether to multiply or divide, ask yourself; should the number of tons be greater or smaller than the number of grams?
The densities of the objects are as follows:
Sun: 1.41 g/cm^3
Red Giant: 0.0282 g/cm^3
Neutron Star: 949 g/cm^3
Additionally, one teaspoon of neutron star material weighs approximately 0.0053 tons.
The average densities of several objects were calculated based on their masses and radii. The objects considered were the Sun, a red giant with twice the Sun's mass and 100 times its radius, and a neutron star with twice the mass of the Sun but the radius of a city.
The Sun:
Mass: 1.99 × 10^33 grams
Radius: 6.96 × 10^10 centimeters
Volume: (4/3) × π × (6.96 × 10^10)^3 cubic centimeters
Density: Mass/Volume = 1.99 × 10^33 / (4.19 × 10^33) = 1.41 grams per cubic centimeter
Red Giant:
Mass: 3.98 × 10^33 grams (twice the mass of the Sun)
Radius: 6.96 × 10^10 centimeters (100 times the Sun's radius)
Volume: (4/3) × π × (6.96 × 10^10)^3 cubic centimeters
Density: Mass/Volume = 3.98 × 10^33 / (1.41 × 10^35) = 0.0282 grams per cubic centimeter
Neutron Star:
Mass: 3.98 × 10^33 grams (twice the mass of the Sun)
Radius: 10 kilometers = 10^7 centimeters
Volume: (4/3) × π × (10^7)^3 cubic centimeters
Density: Mass/Volume = 3.98 × 10^33 / (4.19 × 10^24) = 949 grams per cubic centimeter
It was determined that one cubic centimeter of neutron star material weighs 949 grams, which is nearly a ton. Since one cubic centimeter occupies a volume of roughly one teaspoon, this tells us exactly how many grams are in one cubic centimeter of neutron star material. To convert grams to tons, considering that there are more grams in one ton, we divide the weight in grams by the conversion factor.
Conversion:
1 ton = 1,000,000 grams
1 teaspoon = 5 cubic centimeters = 5 grams
Therefore, one cubic centimeter of neutron star material weighs 949/5 = 190 grams. Since 1 ton = 1,000,000 grams, one teaspoon of neutron star material would weigh (5/949) tons, which is approximately 0.0053 tons (rounded to four significant figures).
In summary, the densities of the objects are as follows:
Sun: 1.41 g/cm^3
Red Giant: 0.0282 g/cm^3
Neutron Star: 949 g/cm^3
Additionally, one teaspoon of neutron star material weighs approximately 0.0053 tons.
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What is the time constant? s (b) How long will it take to reduce the voltage on the capacitor to 0.100% of its full value once discharge begins? s (c) If the capacitor is charged to a voltage V 0
through a 133Ω resistance, calculate the time it takes to rise to 0.865V 0
(this is about two time constants). S
Therefore, it takes approximately 26.4 seconds to rise to 0.865V0.
Time ConstantIt is the time required by an electric circuit or system to change its state from an initial state to its final state after an abrupt change in one of its variables. The transient response of the circuit or system is characterized by the time constant.
The formula for the time constant in seconds is given by the product of the resistance and the capacitance, i.e.,T=RC(a) To determine the time it takes for the capacitor to discharge to 0.100% of its full value after discharge begins.
Given, V=100% and V'=0.100%It is known that the equation for the capacitor voltage with time during discharge is given by;V = V0e-t/RCSubstituting for the final and initial voltages we have,0.100% V0 = V0e-t/RC
Taking the natural logarithm of both sides,ln(0.001) = -t/RCln(0.001) = -t/1.2 x 10^3 x 2.2 x 10^-6t = 31.2 seconds (to the nearest whole number)Therefore, it will take approximately 31.2 seconds to reduce the voltage on the capacitor to 0.100% of its full value once discharge begins.
(c) If the capacitor is charged to a voltage V0 through a 133Ω resistance, calculate the time it takes to rise to 0.865V0 (this is about two time constants).It is known that the equation for the capacitor voltage with time during charging is given by;V = V0(1 - e-t/RC)
We are required to find the time it takes for the voltage across the capacitor to rise to 0.865V0, which is equivalent to a voltage difference of 0.135V0 from the initial voltage.
Therefore, substituting for the final and initial voltages we have,0.865V0 = V0(1 - e-2T/RC)Rearranging,1 - 0.865 = e-2T/RCln(0.135) = -2T/RCt = 2T = 2 x 1.2 x 10^3 x 2.2 x 10^-6 x ln(0.135)t = 26.4 seconds (to the nearest whole number) Therefore, it takes approximately 26.4 seconds to rise to 0.865V0.
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A wave travelling along a string is described by: y(x,t)=(0.0351 m)sin[(52.3rad/s)x+(2.52rad/s)t] with x in meters and t in seconds. a) What is the wavelength of the wave? b) What is the period of oscillation? c) What is the frequency of the wave?
The frequency of the wave is 8.33 Hz.
The given wave travelling along a string is described by:y(x,t) = (0.0351 m)sin[(52.3rad/s)x + (2.52rad/s)t]Where x is in meters and t is in seconds. To find the wavelength, we use the formula:wavelength (λ) = 2π/kHere, k = (52.3 rad/s), soλ = 2π/kλ = 2π/(52.3 rad/s)λ = 0.120 mTherefore, the wavelength of the wave is 0.120 m.To find the period of oscillation, we use the formula:T = 2π/ωHere, ω = (52.3 rad/s), soT = 2π/ωT = 0.120 sTherefore, the period of oscillation is 0.120 s.To find the frequency of the wave, we use the formula:f = ω/2πHere, ω = (52.3 rad/s), sof = ω/2πf = 8.33 Hz. Therefore, the frequency of the wave is 8.33 Hz.
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A small object begins a free-fall from a height of 25.0 m. After 1.40 s, a second small object is launched vertically upward from the ground with an initial velocity of 37.0 m/s. At what height h above the ground will the two objects first meet? h = ________ m
A small object begins a free-fall from a height of 25.0 m. After 1.40 s, a second small object is launched vertically upward from the ground with an initial velocity of 37.0 m/s.
Height from which first object falls, s₁ = 25.0 m Time elapsed, t = 1.40 s Initial velocity of second object, u₂ = 37.0 m/s
For the first object that undergoes free-fall;
The vertical displacement after time t, s₁ = u₁t + 1/2 gt² -------> (1)
Where u₁ = Initial velocity of the object, g = acceleration due to gravity = 9.81 m/s²
For the second object,
The vertical displacement after time t, s₂ = u₂t - 1/2 gt² ------> (2)
Substitute the given values in the above equations and solve for t
Using equation (1),s₁ = u₁t + 1/2 gt² = 0 + 1/2 x 9.81 x (1.40)² = 12.99 m
Thus, the first object falls a distance of 12.99 m in 1.40 seconds.Now, using equation (2),s₂ = u₂t - 1/2 gt²
Solve the above equation for t
Substitute the values u₂ = 37.0 m/s t = Time at which the two objects meet g = 9.81 m/s²∴ t = s₂/g = (u₂t - s₁)/g
On substituting the given values we get, t = (37.0 x 1.40 - 12.99) / 9.81= 3.59 s
Now, the height at which the two objects will first meet is given by the equation, s = s₁ + u₁t Where u₁ = 0 m/s (as it is in free-fall)
Substituting the values we get, s = 25.0 + 0 x 3.59= 25.0 m
Therefore, the height at which the two objects will first meet is 25.0 m.
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A fisherman noticed that a wave strikes the boat side every 5 seconds. The distance between two consecutive crests is 1.5 m. What is the period and frequency of the wave? What is the wave speed?
What is the wave speed if the period is 7.0 seconds and the wavelength is 2.1 m?
What is the wavelength of a wave traveling with a speed of 6.0 m/s and the frequency of 3.0 Hz?
The period of the wave is the time interval between two consecutive crests, while the frequency of a wave is the number of crests that pass a point in a unit time. Hence, we can find the period and frequency using the given information.
Distance between two consecutive crests is 1.5m.
A wave strikes the boat side every 5 seconds.
a) Period and frequency of the wave
The period is the time interval between two consecutive crests. We are given that the wave strikes the boat side every 5 seconds. Hence, the period of the wave is T=5s.The frequency of the wave is the number of crests that pass a point in a unit time. The time taken to complete one wave is the period, T. Hence, the number of crests that pass a point in 1 second is the reciprocal of T.
Therefore, the frequency of the wave is:
f=1/T=1/5=0.2Hz
b) The wave speed
We can use the formula to find the wave speed,
v=fλ
where, v = wave speed, f = frequency and λ = wavelength.
Substituting f = 0.2Hz and λ = 1.5m, we getv=0.2×1.5v=0.3m/s
c) The wavelength of a wave traveling with a speed of 6.0 m/s and the frequency of 3.0 Hz
We can use the formula, v = fλ to find the wavelength.
Rearranging this equation, we get:
λ=v/f=6/3=2m
Hence, the wavelength of the wave is 2m.
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A truck is driving along the highway behind a tractor when it pulls out to pass. If the truck's acceleration is uniform at 2.3 m/s² for 3.2 s and it reaches a speed of 31 m/s, what was its speed when it first pulled out to pass the tractor? 1) 45 m/s 2) 38 m/s 3) 31 m/s 4) 24 m/s 5) 17 m/s
The atomic cross sections for 1-MeV photon interactions with carbon and hydrogen are, respectively, 1.27 barns and
0.209 barn.
(a) Calculate the linear attenuation coefficient for paraffin. (Assume the composition CH2 and density 0.89 g/ cm3.)
(b) Calculate the mass attenuation coefficient.
The linear attenuation for paraffin is 0.75cm-1 and the mass attenuation coefficient is 902 cm2/kg. Calculation for both the attenuation is given below in detail.
(a) Linear attenuation coefficient: Linear attenuation coefficient (μ) refers to the attenuation coefficient of a beam or radiation per unit length of material. The linear attenuation coefficient can be determined using the following equation:μ = σ × nwhereσ is the atomic cross section, and n is the number of atoms per unit volume (atoms/cm3). The following formula may be used to calculate the linear attenuation coefficient for paraffin. Linear attenuation coefficient for carbon is given by,μC = σC × nC. The linear attenuation coefficient for hydrogen is given by,μH = σH × nH. The composition of paraffin is CH2, meaning it is made up of one carbon atom, two hydrogen atoms, and two hydrogen atoms. We can thus calculate the number of atoms per unit volume for carbon and hydrogen atoms. We can use the equation below to calculate the linear attenuation coefficient:μ = (μC × wC + μH × wH) where wC and wH are the weights of carbon and hydrogen, respectively. Linear attenuation coefficient for carbon:μC = σC × nCwhereσC = 1.27 barns nC = 2.69 × 1022 atoms/cm3(from the density of paraffin)The weight of carbon in CH2 = 12 g/mole× 1 mole/14 g × (1 g/ cm3) = 0.857 g/cm3wC = 0.857 g/cm3 / (12 g/mole) = 0.0714 moles/cm3The number of carbon atoms in 0.0714 moles = 0.0714 × 6.02 × 1023 atoms/mole= 4.30 × 1022 atoms/cm3Linear attenuation coefficient for carbon:μC = 1.27 barns × 4.30 × 1022 atoms/cm3= 5.47 cm2/g. For hydrogen:μH = σH × nHwhereσH = 0.209 barnsnH = 5.38 × 1022 atoms/cm3(from the density of paraffin)The weight of hydrogen in CH2 = 2 g/mole× 1 mole/14 g × (1 g/ cm3) = 0.143 g/cm3wH = 0.143 g/cm3 / (1 g/mole) = 0.143 moles/cm3. The number of hydrogen atoms in 0.143 moles = 0.143 × 6.02 × 1023 atoms/mole= 8.60 × 1022 atoms/cm3 Linear attenuation coefficient for hydrogen:μH = 0.209 barns × 8.60 × 1022 atoms/cm3= 1.80 cm2/g. The linear attenuation coefficient for paraffin:μ = (μC × wC + μH × wH)= (5.47 cm2/g × 0.0714 moles/cm3) + (1.80 cm2/g × 0.143 moles/cm3)= 0.75 cm-1
(b) Mass attenuation coefficient: Mass attenuation coefficient (μ/ρ) refers to the linear attenuation coefficient of a substance per unit mass of the material. The mass attenuation coefficient can be determined using the following equation:μ/ρ = σ/ρwhereρ is the density of the material. The mass attenuation coefficient of paraffin is obtained using the equation below:μ/ρ = (μC × wC + μH × wH) / ρwhere wC and wH are the weights of carbon and hydrogen, respectively.The density of paraffin is 0.89 g/cm3. The weight of carbon and hydrogen are already known.The mass attenuation coefficient of paraffin:μ/ρ = [(5.47 cm2/g × 0.0714) + (1.80 cm2/g × 0.143)] / 0.89 g/cm3= 0.0902 cm2/g or 902 cm2/kg.
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3cos(wt/3), where I is in meters and t in seconds. The acceleration of the particle The position of a partide is given by in my when2mis 249 2.1 275 228
The given equation represents the position of a particle as a function of time, given by x(t) = 3cos(wt/3), where x is in meters and t is in seconds. To find the acceleration of the particle, we need to take the second derivative of the position function with respect to time.
The first derivative of x(t) gives us the velocity function v(t):
v(t) = dx(t)/dt = -3w/3 * sin(wt/3)
Differentiating again, we find the second derivative, which is the acceleration function a(t):
a(t) = dv(t)/dt = d²x(t)/dt² = (-3w/3)² * cos(wt/3)
Simplifying further, we get:
a(t) = w² * cos(wt/3)
The acceleration of the particle, a(t), is given by w² times the cosine of wt/3.
In the given context, the values of w, which is the angular frequency, are not provided. Therefore, we cannot determine the specific numerical value of the acceleration. However, we can analyze its behavior based on the equation. The acceleration is directly proportional to w², meaning that increasing the value of w will result in a larger acceleration. Additionally, the cosine function oscillates between -1 and 1, so the acceleration will oscillate between -w² and w².
In summary, the acceleration of the particle is given by the equation a(t) = w² * cos(wt/3). The specific numerical value of the acceleration depends on the value of the angular frequency w, which is not provided in the given information.
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You are given a lens that is thinner in the center than at the edges. Questions 23-24 refer to this lens. This lens is: Concave Diverging Convex Converging You are given a lens that is thinner in the center than at the edges. Questions 23-24 refer to this lens. This lens could be used to remedy: Glaucoma Cataracts Nearsightedness Farsightedness
A lens that is thinner in the center than at the edges is called a concave or diverging lens. It is denoted by a negative sign (-).So the correct option is (B) diverging lens and it is used to remedy myopia or nearsightedness.
Nearsightedness occurs when the light rays entering the eye are focused in front of the retina instead of directly on it. As a result, the individual can see nearby objects more clearly than distant objects.A diverging lens is used to correct nearsightedness by spreading out the light rays entering the eye so that they are focused directly on the retina. This results in the distant objects appearing clearer to the individual.
The other options, such as glaucoma, cataracts, and farsightedness are not corrected by a diverging lens.
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Light from a helium-neon laser (A= 633 nm) passes through a circular aperture and is observed on a screen 4.40 m behind the aperture. The width of the central maximum is 1.60 cm. You may want to review (Page 948). Y Part A What is the diameter (in mm) of the hole?
The diameter of the hole through which the light passes is approximately 1.7425 mm.
To determine the diameter of the hole through which light from a helium-neon laser passes, given the wavelength (A = 633 nm), the distance to the screen (4.40 m), and the width of the central maximum (1.60 cm), we can use the formula for the width of the central maximum in the single-slit diffraction pattern.
In a single-slit diffraction pattern, the width of the central maximum (W) can be calculated using the formula:
W = (λ × D) / d
Where:
λ is the wavelength of the light,
D is the distance from the aperture to the screen, and
d is the diameter of the hole.
Given:
λ = 633 nm = 633 × [tex]10^{-9}[/tex] m,
D = 4.40 m, and
W = 1.60 cm = 1.60 × [tex]10^{-2}[/tex] m.
Rearranging the formula, we can solve for d:
d = (λ × D) / W
= (633 × [tex]10^{-9}[/tex] m × 4.40 m) / (1.60 × [tex]10^{-2}[/tex] m)
= 1.7425 × [tex]10^{-3}[/tex] m
= 1.7425 mm
Therefore, the diameter of the hole through which the light passes is approximately 1.7425 mm.
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Determine the propagation constant of the travelling wave in a helix TWT operating at 10 GHz. Assume that the attenuation constant of the tube is 2 Np/m, the pitch length is 1.5mm and the diameter of the helix is 8mm. b) A two-cavity klystron operates at 5 GHz with D.C. beam voltage 10 Kv and cavity gap 2mm. For a given input RF voltage, the magnitude of the gap voltage is 100 Volts. Calculate the gap transit angle and beam coupling coefficient.
In a helix travelling wave tube (TWT) operating at 10 GHz, with an attenuation constant of 2 Np/m, pitch length of 1.5 mm, and helix diameter of 8 mm, the propagation constant is approximately 1.249 x 10^8 rad/m - 2 Np/m.
For the helix TWT, the propagation constant is calculated using the formula β = ω√(με) - α. The phase velocity and effective dielectric constant are determined based on the given parameters, resulting in a propagation constant of approximately 1.249 x 10^8 rad/m - 2 Np/m.
This constant describes the rate at which the wave propagates through the helix TWT.
Moving on to the two-cavity klystron, the gap transit angle (ϕ) is found using the formula (V_g/V_dc) × (2d/λ), where V_g is the gap voltage, V_dc is the D.C. beam voltage, d is the cavity gap, and λ is the wavelength of the RF signal.
With the given values, the gap transit angle is determined. Additionally, the beam coupling coefficient (η) is calculated using (V_g/V_rf) × sin(ϕ), where V_rf is the RF voltage. By substituting the known values, the beam coupling coefficient is obtained, indicating the coupling efficiency between the electron beam and RF signal in the klystron.
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A tank was initially filled with 100 gal of salt solution containing 1 lb of salt per gallon. Fresh brine containing 2 lbs of salt/gal runs into the tank at a rate of 5 gal/min, and the mixture, assumed uniform, runs out at the same rate. At what time will the concentration of the salt in the tank become? Select one: O a. 55 min O b. 28 min O c. 32 min O d. 14 min
The concentration of salt in the tank will become 2 lbs/gal after 14 minutes. Hence, the correct option is (d) 14 min.
The initial volume of the tank = 100 galInitial salt concentration = 1 lb/gal.Salt solution = 100 × 1 = 100 lbs.Initially, we have a total of 100 lbs of salt in the tank.Let us assume that after t minutes, the concentration of salt in the tank will become x.Now, we need to write a differential equation for this mixture. The amount of salt in the mixture is equal to the amount of salt that flows in minus the amount of salt that flows out.dA/dt = (C1 × V1 - C2 × V2) /V.
Where, A = amount of salt in the mixture.C1 = initial salt concentration = 1 lb/gal.C2 = salt concentration in incoming brine = 2 lb/gal.V1 = volume of salt solution in the tank at any time = (100 + 5t) galV2 = volume of incoming brine = 5 galV = volume of the mixture at any time = (100 + 5t) gal.dA/dt = (1 × (100 + 5t) - 2 × 5)/ (100 + 5t) ... (1)On simplifying the above equation, we getdA/dt = (100 - 5t)/ (100 + 5t) ... (2)Separating variables and integrating, we get∫ (100 + 5t) / (100 - 5t) dt = ∫ dA / A∫ (100 + 5t) / (100 - 5t) dt = ln |A| + C... (3)On integrating (3), we get-10 ln |100 - 5t| = ln |A| + C (solving for constant).
Therefore,-10 ln |100 - 5t| = ln |100| + C... (4)When t = 0, the salt concentration is 1 lb/gal. So,100 lbs of salt and 100 gallons of solution are there in the tank.Therefore,100 = V × 1 => V = 100 gallonsSubstitute this in equation (4).-10 ln |100 - 5t| = ln |100| + ln |A| (simplifying C = ln |A|)ln |100 - 5t|^(-10) = ln (100 × |A|)... (5)ln |100 - 5t| = -ln (100 × |A|)^(1/10)ln |100 - 5t| = -ln (|A|)^(1/10) × ln (100)^(1/10)ln |100 - 5t| = -0.5 ln |A| ... (6)Let the salt concentration becomes 2 lb/gal after time t.So, we need to find the value of t such that x = 2 lb/gal.
The amount of salt in the mixture at any time A = V × xA = (100 + 5t) × 2A = 200 + 10tOn substituting A = 200 + 10t and x = 2 in equation (6), we getln |100 - 5t| = -0.5 ln (200 + 10t)... (7)Solving for t in equation (7)100 - 5t = (200 + 10t)^(-0.5)100 - 5t = (2 + t)^(-1)100 - 5t = 1 / (2 + t)t = 14 minutes (approx)Therefore, the concentration of salt in the tank will become 2 lbs/gal after 14 minutes. Hence, the correct option is (d) 14 min.
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2.The time needed for a car whose speed is 30 km/h to travel 600 m is O 0.5 min O 1.2 min O 2 min 20 min
We are given the speed of a car as 30 km/h and the distance it covers as 600m. We need to find the time taken for the car to cover the given distance. We know that distance = speed x time, therefore, we can find the time taken as:
time = distance/speedtime
= 600m/(30 km/h)
= 600m/(30/60) m/min
= 1200/30 mintime
= 40 min
Therefore, the time needed for a car whose speed is 30 km/h to travel 600 m is 40 minutes (1200/30).
The time taken by the car to travel 600m is found by dividing the given distance by the speed of the car. Here, the car's speed is given as 30 km/h and the distance it covers is 600m. We convert the given speed to m/min to obtain the time taken for the car to travel the given distance in minutes.
Thus, the time taken for the car whose speed is 30 km/h to travel 600 m is 40 minutes (1200/30).
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A proton is launched with a speed of 3.20×10 6
m/s perpendicular to a uniform magnetic field of 0.310 T in the positive z direction. (a) What is the radius of the circular orbit of the proton? cm (b) What is the frequency of the circular movement of the proton in this field?
The answer is a) the radius of the circular orbit of the proton is approximately 6.72 cm. and b) the frequency of the circular movement of the proton in this field is 7.59 x [tex]10^4[/tex] Hz.
When a proton is launched with a speed of 3.20 x [tex]10^6[/tex] m/s perpendicular to a uniform magnetic field of 0.310 T in the positive z direction, circular motion occurs due to the magnetic force acting on the proton. It is a consequence of the Lorentz force experienced by the particle, which acts as a centripetal force on the proton as it travels through the magnetic field.
Part (a): In a circular motion, the magnetic force acting on the proton is given by F = qvB, where F is the magnetic force, q is the charge of the proton, v is the velocity of the proton and B is the magnetic field.
The force acting on the proton creates a centripetal acceleration given by a = [tex]v^2/r.[/tex]
Here, r is the radius of the circular orbit of the proton, which is given by: r = mv/qB where m is the mass of the proton.
Substituting the given values in the above expression, r = [(1.673 x [tex]10^-27[/tex]kg)(3.20 x[tex]10^6 m/s[/tex])]/[(1.602 x[tex]10^-19 C[/tex])(0.310 T)] = 0.0672 m = 6.72 cm (approximately)
Therefore, the radius of the circular orbit of the proton is approximately 6.72 cm.
Part (b): The frequency of the circular movement of the proton in this field is given by f = v/2πr, where v is the velocity of the proton and r is the radius of the circular orbit.
Substituting the given values in the above expression, f = (3.20 x [tex]10^6[/tex]m/s)/[2π(0.0672 m)] = 7.59 x [tex]10^4[/tex] Hz
Therefore, the frequency of the circular movement of the proton in this field is 7.59 x [tex]10^4[/tex] Hz.
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A 2000 kg car accelerates from 28 m/s to a stop in 45 m. Determine the magnitude of the average acceleration during that time. 8.7 m/s 2
9.8 m/s 2
6.5 m/s 2
1.3 m/s 2
The correct option is 6.5 m/s².
Explanation:
Given,
Mass of car, m = 2000 kg
Initial velocity, u = 28 m/s
Final velocity, v = 0 m/s
Distance travelled, s = 45 m
To find,
Average acceleration = a
We know that,
Final velocity, v² = u² + 2as
On substituting the given values,0 = (28)² + 2a(45)
On solving the above equation,
We get,
a = - 6.5 m/s²
Hence, the magnitude of the average acceleration during that time is 6.5 m/s².
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A radio station transmits isotropically (ie in all directions) electromagnetic radiation at a frequency of 100.8 MHz. At a certain distance from the radio station the intensity of the wave is I=0.267 W/m^2.
a) What will be the intensity of the wave at a quarter of the distance from the radio station?
b) What is the wavelength of the transmitted signal?
If the power of the antenna is 5 MW.
c) At what distance from the source will the intensity of the wave be 0.134 W/m^2?
d) and what will be the absorption pressure exerted by the wave at that distance?
e) and what will be the effective electric field (rms) exerted by the wave at that distance?
a) The intensity at a quarter of the distance is 1.068 W/[tex]m^2[/tex].
b) The wavelength of the transmitted signal is approximately 2.972 m.
c) tThe distance from the source when the intensity is 0.134 W/[tex]m^2[/tex] is approximately 1183.5 m.
d) The absorption pressure at that distance is approximately 4.47 x [tex]10^{-10}[/tex] Pa.
e) The effective electric field (rms) at that distance is approximately 1.32 x [tex]10^{-4}[/tex] V/m.
To solve the given problems, we need to use the formulas related to electromagnetic waves and their properties.
a) The intensity of a wave is inversely proportional to the square of the distance from the source.
Therefore, if the distance is reduced to a quarter, the intensity will increase by a factor of 4.
Thus, the intensity at a quarter of the distance from the radio station will be 4 times the initial intensity: I = 4 * 0.267 W/[tex]m^2[/tex] = 1.068 W/[tex]m^2[/tex].
b) The wavelength of a wave can be determined using the formula: wavelength = speed of light / frequency.
The speed of light in a vacuum is approximately 3 x 10^8 m/s.
Converting the frequency from MHz to Hz, we have f = 100.8 x 10^6 Hz.
Substituting these values into the formula, we get: wavelength = (3 x 10^8 m/s) / (100.8 x 10^6 Hz) ≈ 2.972 m.
c) To find the distance from the source when the intensity is 0.134 W/[tex]m^2[/tex], we rearrange the formula for intensity and distance: distance = √(power / (4π * intensity)).
Given that the power of the antenna is 5 MW (5 x 10^6 W) and the intensity is 0.134 W/[tex]m^2[/tex], we can calculate the distance: distance = √((5 x 10^6 W) / (4π * 0.134 W/m^2)) ≈ 1183.5 m.
d) The absorption pressure exerted by the wave can be calculated using the formula: pressure = intensity / (speed of light).
Substituting the intensity and the speed of light, we get: pressure = 0.134 W/[tex]m^2[/tex] / (3 x 10^8 m/s) ≈ 4.47 x 10^-10 Pa.
e) The effective electric field (rms) can be determined using the formula: electric field = √(2 * power / (speed of light * area)).
Given that the power is 5 MW, the speed of light is 3 x 10^8 m/s, and assuming the wave is spreading in all directions (isotropic), the area is 4π[tex]r^2[/tex], where r is the distance.
Substituting these values, we have: electric field = √(2 * (5 x 10^6 W) / (3 x 10^8 m/s * (4π * (1183.5 m)^2))) ≈ 1.32 x [tex]10^{-4}[/tex] V/m.
In summary, a) the intensity at a quarter of the distance is 1.068 W/[tex]m^2[/tex], b) the wavelength of the transmitted signal is approximately 2.972 m, c) the distance from the source when the intensity is 0.134 W/[tex]m^2[/tex] is approximately 1183.5 m, d) the absorption pressure at that distance is approximately 4.47 x [tex]10^{-10}[/tex] Pa, and e) the effective electric field (rms) at that distance is approximately 1.32 x [tex]10^{-4}[/tex] V/m.
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An object 25cm away from a lens produces a focused image on a film 15cm away.What is the focal length of the converging lens?
formula for calculating the focal length of a converging lens is:
1/f = 1/v - 1/u
where f is the focal length of the lens, v is the distance between the lens and the image plane (film), and u is the distance between the lens and the object.
In this case, the object is 25 cm away
a. Lights enters an unknown material from air at 47 degrees and is refracted to 28.1 degrees. Find the index of refraction of the new material
b. (Image is for b) This image shows two mirrors with a 120 degree angle between them. The incident angle to the first mirror is 65 degrees. What is the angle of reflection off of the second mirror?
a. The index of refraction of the new material is approximately 1.51.
b. The angle of reflection off the second mirror is 55 degrees.
a. To find the index of refraction of the new material, use the formula:n1sinθ1 = n2sinθ2, where n1 is the index of refraction of the original material (in this case, air), θ1 is the angle of incidence, n2 is the index of refraction of the new material, and θ2 is the angle of refraction. Substitute the given values: n1 = 1, θ1 = 47°, θ2 = 28.1°.
Then, n1sinθ1 = n2sinθ2 => 1(sin47°) = n2(sin28.1°) => n2 = sin47°/sin28.1°.
This evaluates to n2 = 1.51 (rounded to two decimal places).
Therefore, the index of refraction of the new material is approximately 1.51.
b. According to the laws of reflection, the angle of incidence equals the angle of reflection.
Therefore, the angle of reflection off the first mirror is 65 degrees.
Subsequently, we need to find the angle of incidence on the second mirror to calculate the angle of reflection of it.
We know that the two mirrors are at an angle of 120 degrees between them and that the angle of incidence is equal to the angle of reflection.
Thus, the angle of incidence on the second mirror will be 120 - 65 = 55 degrees. Then, the angle of reflection off the second mirror will be the same as the angle of incidence, so it will be 55 degrees.
a. The index of refraction of the new material is approximately 1.51.
b. The angle of reflection off the second mirror is 55 degrees.
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It was once the world's highest amusement ride in Las Vegas, Nevada. A 160.ft tower built on the upper deck of the 921ft Stratosphere Tower, with a carriage that would launch riders from rest to 45.0 mph. It literally felt like you would be launched right off the top of the tower. Ride safety, and for the safety of people below, requires all loose items to be left at the station before boarding. Note: the acceleration of this ride is not constant up the 160.ft spire, but it produces a maximum of 4g. Suppose a rider got away with carrying a purse on the ride. If the purse + contained items weigh 5.00 lbs, calculate the applied force in Ibs!) the rider must apply to keep hold of the purse under both the published 4g acceleration as well as half that. 4g applied force: ______ lbs. How many bottles of milk is this (approx. and use whole number): ________. Is it likely the rider could hold the purse? _______
2g applied force: _______ lbs. Could the average rider hold the purse? ______
The force applied by the rider to hold the purse under 4g acceleration is 6.08 lbs. The force applied by the rider to hold the purse under 2g acceleration is 3.04 lbs. The average rider could hold the purse under 2g acceleration, but it is unlikely that they could hold it under 4g acceleration.
Weight of the purse = 5.00 lbs
Acceleration of the ride:
For 4g: a = 4g = 4 * 9.81 m/s²For 2g: a = 2g = 2 * 9.81 m/s²To find: The force applied by the rider to hold the purse under both 4g and 2g acceleration.
For 4g applied force:
The acceleration on the ride is a = 4g * g = 4 * 9.81 m/s² = 39.24 m/s²
The mass of the purse can be calculated as:
mass = weight / g = 5.00 lbs / 32.2 ft/s² = 0.155 lbs
Therefore, the force applied by the rider to hold the purse is:
force = mass * acceleration = 0.155 lbs * 39.24 m/s² = 6.08 lbs
The force applied by the rider to hold the purse under 4g acceleration is 6.08 lbs.
For 2g applied force:
The acceleration on the ride is a = 2g * g = 2 * 9.81 m/s² = 19.62 m/s²
The mass of the purse can be calculated as:
mass = weight / g = 5.00 lbs / 32.2 ft/s² = 0.155 lbs
Therefore, the force applied by the rider to hold the purse is:
force = mass * acceleration = 0.155 lbs * 19.62 m/s² = 3.04 lbs
The force applied by the rider to hold the purse under 2g acceleration is 3.04 lbs.
Hence, the average rider could hold the purse under 2g acceleration, but it is unlikely that they could hold it under 4g acceleration.
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