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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 13 | A wave travels in a string at 60 m/s. A second string of 20% greater linear density has the same tension applied as in the first string. What will be the resulting wave speed in the second string? | 55 m/s | |
| 13 | An earthquake emits both P-waves and S-waves that travel at different speeds through the Earth. A P-wave travels at 8 000 m/s and an S-wave at 4 000 m/s. If P-waves are received at a seismic station 30.0 s before an S-wave arrives, how far is the station from the earthquake center? | 240 km | |
| 13 | An object is attached to a spring and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is four times the original value. By what factor is the frequency of oscillation changed? | 1/2 | |
| 13 | An object moving in simple harmonic motion has an amplitude of 0.020 m and a maximum acceleration of 40 m/s2. What is the frequency of the system? | 7.1 Hz | |
| 13 | An ore car of mass 4 000 kg rolls downhill on tracks from a mine. At the end of the tracks, 10.0 m lower in elevation, is a spring with k = 400 000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction. | 1.40 m | |
| 13 | As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the tops of the plants sway back and forth. This wave is a: 1) transverse wave. 2) longitudinal wave. 3) polarized wave. 4) interference of waves. 5) both choices B and C are valid. | longitudinal wave. | |
| 13 | Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect? | 5.5 mm | |
| 13 | By what factor must one change the weight suspended vertically from a spring coil in order to triple its period of simple harmonic motion? | 9.0 | |
| 13 | By what factor should the length of a simple pendulum be changed if the period of vibration were to be tripled? | 9.0 | |
| 13 | Consider the curve f(x) = A cos(2πx/λ). The wavelength of the wave will be: | twice the distance x2 to x3. | |
| 13 | Consider the curve x = A sin(kt), with A > 0. At which point on the graph is it possible that t = 0? | Point t3 | |
| 13 | Consider two identical and symmetrical wave pulses on a string. Suppose the first pulse reaches the fixed end of the string and is reflected back and then meets the second pulse. When the two pulses overlap exactly, the superposition principle predicts that the amplitude of the resultant pulses, at that moment, will be what factor times the amplitude of one of the original pulses? | 0 | |
| 13 | Equal wavelength waves of amplitude 0.25 m and 0.15 m interfere with one another. What is the resulting minimum amplitude that can result? | 0.10 m | |
| 13 | For a mass suspended on a spring in the vertical direction, the time for one complete oscillation will depend on: 1) the value for g (the acceleration due to gravity). 2) the distance the mass was originally pulled down. 3) the maximum speed of the oscillating mass. 4) the time doesn't depend on any of the above. 5) both choices A and C are valid. | the time doesn't depend on any of the above. | |
| 13 | For a wave on the ocean, the amplitude is: 1) the distance between crests. 2) the height difference between a crest and a trough. 3) one half the height difference between a crest and a trough. 4) how far the wave goes up on the beach. 5) one half the distance between crests. | one half the height difference between a crest and a trough. |
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