A mass was firmly attached to a spring. The other end of the spring was shaken at different frequencies. What did you observe about the amplitude of vibration of the mass?
  • the can was crushed
  • The pressure is equal to that at a depth of 10 m plus the weight per 1 m2 cross sectional area of a column of seawater 10 m high.
  • Two points on a horizontal line, connected by a single liquid in hydrostatic equilibrium, are at the same pressure. pA=pB
  • The amplitude was small for low frequency and for high frequency; in between there was a frequency where the amplitude was very large
Why don't ships made of iron sink?
  • since the ship is not solid iron, the average density is less than the density of water
  • it is the same on both blocks (since they both displace the same amount of water)
  • when the source of a wave travels faster than the speed of the wave
  • equals the frequency times its wavelength. (speed depends on the properties of the medium)
A point on a standing wave that is always stationary is a(n) _____.
  • node
  • 3 g of mercury
  • 10 Hz
  • 3 dB
Now assume for the remaining Parts G - J, that the x coordinate of point R is 0.12 m and the t coordinate of point K is 0.0050 s. How much time t does the block take to travel from the point of maximum displacement to the opposite point of maximum displacement?
  • superposition
  • 100,000 times
  • 0.01 seconds
  • 0.48 meters
Now assume for the remaining Parts G - J, that the x coordinate of point R is 0.12 m and the t coordinate of point K is 0.0050 s. What distance d does the object cover during one period of oscillation?
  • 0.025 seconds
  • 0.02 seconds
  • 100,000 times
  • 0.48 meters
A source producing sound at a frequency of 1000 Hz moves towards Nancy and away from Pablo. Nancy hears the sound at a frequency
  • remove water
  • wave speed and wavelength,
  • greater than 1000 Hz
  • the harmonic content
You can decrease the frequency of a standing wave on a string by __________.
  • equals the frequency times its wavelength. (speed depends on the properties of the medium)
  • using a thicker string, decreasing the tension, and making the string longer
  • it is the same on both blocks (since they both displace the same amount of water)
  • is about the same as the natural frequency of vibration of the water
If the bob's mass is doubled, approximately what will the pendulum's new period be?
  • T
  • both R and Q (min and max amplitudes)
  • resonant
  • It will no longer oscillate because both the pendulum and the point to which it is attached are in free fall.
An oscillating object takes 0.10 s to complete one cycle; that is, its period is 0.10 s. What is its frequency f?
  • 3 dB
  • beats
  • nodes
  • 10 Hz
The magnitude of the buoyant force equals the weight of the object.Under what circumstances is this statement true?
  • for an object that sinks
  • for an object completely submerged in a fluid
  • nothing will be different
  • for an object that floats
the relationship v= f(wavelength) means that the speed of a wave
  • it is the same on both blocks (since they both displace the same amount of water)
  • The volume of water that is displaced by the boat is less for salt water than for fresh water
  • equals the frequency times its wavelength. (speed depends on the properties of the medium)
  • Sounds are not transmitted through space
A shock wave is produced
  • when the source of a wave travels faster than the speed of the wave
  • since the ship is not solid iron, the average density is less than the density of water
  • it is the same on both blocks (since they both displace the same amount of water)
  • pressure and density are higher than average and the air molecules are closer together than average
Sound waves in air are ______ waves
  • 100,000 times
  • 3 g of mercury
  • Sounds are not transmitted through space
  • longitudinal
aving established that a sound wave corresponds to pressure fluctuations in the medium, what can you conclude about the direction in which such pressure fluctuations travel?
  • pressure and density are higher than average and the air molecules are closer together than average
  • Yes, when the mass passes through its equilibrium point (ex. when x=0)
  • Pressure fluctuations travel along the direction of propagation of the sound wave.
  • The object would float submerged less deeply than in the first container.
The pressure at 10 m below the surface of the ocean is about 2.00×105 Pa . Now consider the pressure 20 m below the surface of the ocean. Which of the following statements is true?
  • they travel the same speed (same medium = same speed)
  • The pressure is equal to that at a depth of 10 m plus the weight per 1 m2 cross sectional area of a column of seawater 10 m high.
  • it is the same on both blocks (since they both displace the same amount of water)
  • Two points on a horizontal line, connected by a single liquid in hydrostatic equilibrium, are at the same pressure. pA=pB
Two objects, T and B, have identical size and shape and have uniform density. They are carefully placed in a container filled with a liquid. Both objects float in equilibrium. Less of object T is submerged than of object B, which floats, fully submerged, closer to the bottom of the container. Which of the following statements is true?
  • c) greater than 1250 Hz (relative motion is together)
  • Object B has a greater density than object T.
  • b) equal to 1250 Hz (since there is no relative motion)
  • move to the left until it reaches x=−A and then begin to move to the right
Based on the information presented in the introduction of this problem, what is a sound wave?
  • Propagation of pressure fluctuations in a medium
  • both R and Q (min and max amplitudes)
  • The volume of water that is displaced by the boat is less for salt water than for fresh water
  • More than one of these outcomes is possible.
If the strings have the same thickness but different lengths, which of the following parameters, if any, will be different in the two strings?
  • the harmonic content
  • nothing will be different
  • both R and Q (min and max amplitudes)
  • wave speed and wavelength,
Why can no one hear you scream in space?
  • equals the frequency times its wavelength. (speed depends on the properties of the medium)
  • Small mass and stiff spring
  • Sounds are not transmitted through space
  • since the ship is not solid iron, the average density is less than the density of water
The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same total volume as the object.Under what circumstances is this statement true?
  • for an object completely submerged in a fluid
  • for every object submerged partially or completely in a fluid
  • More than one of these outcomes is possible.
  • for an object that sinks
Which points on the x axis are located a distance A from the equilibrium position?
  • both R and Q (min and max amplitudes)
  • a single pitch with varying loudness
  • Propagation of pressure fluctuations in a medium
  • More than one of these outcomes is possible.
The siren of a police car has a frequency of 1250 Hz when at rest. The police car is traveling to the right at 25 m/s, chasing a bank robber whose car is also traveling to the right at 25 m/s. The bank robber hears the siren at a frequencya)less than 1250 Hzb) equal to 1250 Hzc) greater than 1250 Hzd) the robber cannot hear the siren since the car is going faster than the police car
  • equals the frequency times its wavelength. (speed depends on the properties of the medium)
  • they travel the same speed (same medium = same speed)
  • b) equal to 1250 Hz (since there is no relative motion)
  • move to the left until it reaches x=−A and then begin to move to the right
An object is floating in equilibrium on the surface of a liquid. The object is then removed and placed in another container, filled with a less dense liquid. What would you observe?
  • Propagation of pressure fluctuations in a medium
  • Yes, when the mass passes through its equilibrium point (ex. when x=0)
  • a much lower pitch (about an octave lower)
  • More than one of these outcomes is possible.
The interference of two sound waves of similar amplitude but slightly different frequencies produces a loud-soft-loud oscillation we call __________.
  • resonant
  • 10 Hz
  • 3 dB
  • beats
A certain sound is recorded by a microphone. The same microphone then detects a second sound, which is identical to the first one except that it has twice the frequency. In addition to the higher frequency, what distinguishes the second sound from the first one?
  • a single pitch with varying loudness
  • It is perceived as higher in pitch.
  • More than one of these outcomes is possible.
  • It is perceived as louder
Two tuning forks, of slightly different frequencies were sounded together. You heard
  • the surface area over which it acts increases
  • a single pitch with varying loudness
  • they travel the same speed (same medium = same speed)
  • everywhere, they overlap
An object is floating in equilibrium on the surface of a liquid. The object is then removed and placed in another container, filled with a denser liquid. What would you observe?
  • More than one of these outcomes is possible.
  • Object B has a greater density than object T.
  • The object would float submerged less deeply than in the first container.
  • The amplitude was small for low frequency and for high frequency; in between there was a frequency where the amplitude was very large
Dr. Jenkins played a note on the mouthpiece of his tenor recorder with the end open. He then placed his hand over the end and played a note again. The second note had
  • a single pitch with varying loudness
  • a much lower pitch (about an octave lower)
  • its frequency remains the same; its wavelength increases
  • for an object completely submerged in a fluid
What has a greater density, 3 g of mercury or 500 g of water?
  • superposition
  • remove water
  • 0.48 meters
  • 3 g of mercury
A 100 Hz sound wave is traveling through the air. If we increase the frequency to 200 Hz, this will _____ the wavelength.
  • nodes
  • 0.02 seconds
  • 10 Hz
  • decrease
If the strings have different thicknesses, which of the following parameters, if any, will be different in the two strings?
  • nothing will be different
  • for an object that sinks
  • wave speed and wavelength,
  • Small mass and stiff spring
A Styrofoam brick and a lead brick have the same weight. Which of the following statements is/are correct? a) the two bricks have the same mass b) the volume of the styrofoam brick is greater than the volume of the lead brickc) the density of the lead rich is greater than the density of the styrofoam brickd) both a and be) all of the above
  • e) all of the above
  • move to the left until it reaches x=−A and then begin to move to the right
  • is about the same as the natural frequency of vibration of the water
  • Object B has a greater density than object T.
For the vertical mass-spring system, what can you say about its energy when the mass is at its lowest point?a) the system has its minimum amount of gravitational potential energyb) the system has its maximum amount of elastic and potential energy c) the system has zero kinetic energy (in the reference frame of the spring's support)d) both A and Be) all of the above
  • the can was crushed
  • a) less than 1250 Hz (since the relative motion is apart)
  • c) greater than 1250 Hz (relative motion is together)
  • e) all of the above
An empty pop can had a small amount of water in it. The water was brought to boiling, the can was inverted, and its top was placed in cold water. What happened to the can?
  • the can was crushed
  • the harmonic content
  • superposition
  • 0.02 seconds
When two waves overlap, the displacement of the medium is the sum of the displacements of the two individual waves. This is the principle of __________.
  • Small mass and stiff spring
  • 0.02 seconds
  • superposition
  • the harmonic content
The magnitude of the buoyant force is equal to the weight of fluid displaced by the object.Under what circumstances is this statement true?
  • for an object that floats
  • for every object submerged partially or completely in a fluid
  • its frequency remains the same; its wavelength increases
  • for an object completely submerged in a fluid
If the pendulum is brought on the moon where the gravitational acceleration is about g/6, approximately what will its period now be?
  • beats
  • yes
  • T√6
  • It will no longer oscillate because both the pendulum and the point to which it is attached are in free fall.
If the frequency is 40 Hz, what is the period T ?
  • 3 g of mercury
  • 0.01 seconds
  • 0.025 seconds
  • 100,000 times
A source producing sound at a frequency of 1000 Hz moves towards Nancy and away from Pablo. Pablo hears the sound at a frequency
  • 1000 Hz, 0.344 m
  • less than 1000 Hz
  • the can was crushed
  • greater than 1000 Hz
What varies between two tones that are different in timbre, that is, two tones that have the same fundamental frequency but are produced, say, by different musical instruments?
  • the harmonic content
  • for an object that sinks
  • wave speed and wavelength,
  • 3 g of mercury
Now assume for the remaining Parts G - J, that the x coordinate of point R is 0.12 m and the t coordinate of point K is 0.0050 s. What distance d does the object cover between the moments labeled K and N on the graph?
  • 100,000 times
  • remove water
  • 0.36 meters
  • 0.025 seconds
If you need to raise the frequency of a particular glass, should you add water or remove water?
  • 0.48 meters
  • 100,000 times
  • remove water
  • decrease
The difference in sound level in Autzen stadium when there are 50,000 screaming fans compared to when there are 25,000 screaming fans is about
  • node
  • T√6
  • 3 dB
  • beats
As a sound wave spreads out from a point source its intensity decreases because
  • Propagation of pressure fluctuations in a medium
  • both R and Q (min and max amplitudes)
  • the surface area over which it acts increases
  • they travel the same speed (same medium = same speed)
Several masses are hung from different springs and set vibrating. Which combination vibrated the fastest?
  • for an object that sinks
  • nothing will be different
  • Small mass and stiff spring
  • everywhere, they overlap
Two point sources produce identical sound waves. Where do the wavesinterfere
  • for an object that sinks
  • they travel the same speed (same medium = same speed)
  • everywhere, they overlap
  • a single pitch with varying loudness
Salt water is more dense than fresh water. Why does a boat float higher in salt water than in fresh water?
  • B. The pool balls bounced off each other; the wave pulses passed through each other.
  • The volume of water that is displaced by the boat is less for salt water than for fresh water
  • they travel the same speed (same medium = same speed)
  • Yes, when the mass passes through its equilibrium point (ex. when x=0)
A heavy lead block and a light aluminum block of equal sizes are both submerged in water. Upon which is the buoyant force greater?
  • it is the same on both blocks (since they both displace the same amount of water)
  • It will no longer oscillate because both the pendulum and the point to which it is attached are in free fall.
  • is about the same as the natural frequency of vibration of the water
  • its frequency remains the same; its wavelength increases
Taking the speed of sound in air to be 344 m/s, what are the frequency f and the wavelength λ of the sound wave shown in the graph?
  • 0.02 seconds
  • greater than 1000 Hz
  • 1000 Hz, 0.344 m
  • less than 1000 Hz
The speed of sound in water is greater than in air. When a sound wave travels from air to water what happens to its frequency and wavelength?
  • c) greater than 1250 Hz (relative motion is together)
  • b) equal to 1250 Hz (since there is no relative motion)
  • they travel the same speed (same medium = same speed)
  • its frequency remains the same; its wavelength increases
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