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WorksheetsPHYS 122 SL Midterm Review #1
Total questions: 20
Worksheet time: 20mins
A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true?
Its acceleration is zero.
Its speed is zero.
Its elastic potential energy is zero.
Its kinetic energy is a maximum.
Its total mechanical energy is zero.
Two pendula of equal length are suspended from the ceiling. Pendulum A has a mass of 2.5 kg and Pendulum B has a mass of 5 kg. If Pendulum A has a period of 3 s, what will be the period of Pendulum B?
1.5 s
1.7 s
3 s
6 s
9 s
Four traveling waves are described by the following equations, where all quantities are measured in SI units and y represents the displacement. Which of these waves has the same speed?
y=0.12sin(3x+2t)
y=0.15sin(6x-3t)
y=0.23sin(3x+6t)
y=-0.29sin(1.5x-t)
A position vs time graph is shown for an object undergoing simple harmonic motion. At which point(s) is the object changing direction? Select all that apply.
a
b
c
d
e
Suppose the damping constant b of an oscillator increases. Which of the following is true? Select all that apply.
The total energy in the system remains conserved.
The oscillations damp out more slowly.
The oscillations damp out more quickly.
The time constant τ is decreased
The time constant τ is increased
An object is undergoing simple harmonic motion. It takes 4.5 s for it to complete one full oscillation, which has an amplitude of 10 m. If the object experiences a phase shift of 0 rad, what will be the object’s displacement at t = 2 s?
0 m
10 m
-9.4 m
-4.8 m
5.3 m
A wave of monochromatic light travels from glass to water. If nglass > nwater, in which medium does the wave have a longer wavelength?
Glass, because nglass > nwater, and as n increases, the wave slows down, and wavelength decreases.
Glass, because nglass > nwater, and as n increases, the wave moves faster, and wavelength decreases.
Water, because nglass > nwater, and as n decreases, the speed of the wave increases, and wavelength increases.
Water, because nglass > nwater, and as n decreases, the speed of the wave increases, and wavelength decreases.
They will have the same wavelength as it’s the same wave of light.
An object is undergoing simple harmonic motion. It has a maximum velocity of vmax. Which of the following could you do to decrease the value of vmax? Select all that apply.
Increase the period
Decrease the period
Increase the amplitude
Decrease the amplitude
If the frequency of a sound wave is doubled, by how much will the wavelength of the wave change to ensure that it is travelling at the same speed?
It increases by a factor of 2
It decreases by a factor of 4
It is halved
It is doubled
True or False? k is a measure of a material’s ability to withstand changes in length due to tension or compression.
True
False
You and a friend, who is an astronaut on the moon, are trying to make two different simple pendulums swing at these locations such that the frequency of oscillation is the same in both cases. If the acceleration due to gravity on the moon is 1/6th of that on earth, what is the ratio of the lengths of the pendula?
Learth/Lmoon =1/√6
Learth/Lmoon =1
Learth/Lmoon =1/6
Learth/Lmoon =6
Learth/Lmoon =√6
What is the period of a wave if 10 troughs pass an observer in 2 s?
1 s
2 s
5 s
0.2 s
0.5 s
The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?
0.204 kg
0.815 kg
0.051 kg
0.038 kg
0.062 kg
Which of the following materials has a higher tensile strength?
Material A
Material B
Both have the same tensile strength
A spherical bulb and a cylindrical light both have the same wattage. If they both have the same radius, 2 cm, but the cylindrical light is 30 cm long, which one emits light of higher intensity?
They will emit light of the same intensity as power is the same.
The spherical bulb, because it emits light over a larger area.
The cylindrical light, because it emits light over a larger area.
The spherical bulb, because it emits light over a smaller area.
The cylindrical light, because it emits light over a smaller area.
A physical pendulum on Earth experiences a torque 𝜏1. A second physical pendulum has 1/4 the mass of the first pendulum, and is located on Planet Q, which has four times the gravitational constant as Earth. What is the ratio of 𝜏2/𝜏1?
1
1/2
1/4
1/8
4
Identify which of the following statements about simple harmonic motion are true.
The motion of any system back and forth across an equilibrium position is called simple harmonic motion.
Simple harmonic motion is a type of motion that is very common for systems where there is an equilibrium position.
The frequency of a system moving with simple harmonic motion depends on how far its maximum distance from equilibrium is: wider oscillations take more time.
Springs with masses on the end of them, when slightly displaced from equilibrium, will evolve according to simple harmonic motion.
A pendulum will swing back and forth with simple harmonic motion, but only for relatively small arc lengths, compared to the length of the string.
If the period of this pendulum is 4 s, what is the length of the string?
10 m
2.8 m
6.2 m
4 m
Not enough information to tell
At the turning point of an oscillation:
The velocity and acceleration are both zero.
The velocity and acceleration are both non-zero.
The velocity has its maximal value while the acceleration is zero.
The velocity is zero while the acceleration has its maximal value toward equilibrium.
the velocity is zero while the acceleration has its maximal value away from equilibrium.
A wave has a wavelength of 8 cm and is traveling at 10 m/s through water. What would you expect to happen to the frequency if this wave were to move to air? (Air is less dense than water)
The frequency would increase
The frequency would decrease
The frequency would stay the same
