Midterm PHYSICS 2C – U'17 Answer Key.pdf

# Midterm PHYSICS 2C – U'17 Answer Key.pdf - PHYSICS 2C...

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1 PHYSICS 2C – Summer 2017 Midterm – August 22, 2017 Name Answer Key ID # Signature Multiple Choice – Enter the letter onto the Scantron sheet that best answers the question. [4 points each] 1. What is the frequency of the oscillation shown in the figure to the right? (a) 0.025 Hz, (b) 0.020 Hz, (c) 0.0125 Hz , (d) 0.125 Hz, (e) 1.25 Hz. 2. A simple pendulum has a period of 2.0 s on Earth. If it is taken to a small planet whose acceleration due to gravity is a factor of 9 smaller than Earth’s, the pendulum’s period would be (a) 2.0 s, (b) 4.0 s, (c) 6.0 s , (d) 8.0 s, (e) 12.0 s. 3. A harmonic oscillator begins to vibrate with an amplitude of 1.6 m, but after a time of 1.5 minutes, the amplitude has dropped to 0.80 m. What is the time constant of the damping of this oscillator? (a) 60 s, (b) 80 s, (c) 100 s, (d) 130 s , (e) 150 s. 4. A periodic wave is described by the following function: y ( x , t ) = (1.2 m) sin[(16 m -1 )x – (64 s -1 )t + π /4] What is its wavespeed? (a) 2.0 m/s, (b) 4.0 m/s , (c) 6.0 m/s, (d) 16 m/s, (e) 53 m/s. 5. What is the decibel level of a sound that has an intensity of 2.5x10 -6 W m -2 ? (The intensity of sound at the threshold of hearing is 1x10 -12 W m -2 .) (a) 6.4 dB, (b) 32 dB, (c) 56 dB, (d) 64 dB , (e) 147 dB. 6. A fire engine that emits a sound wave of frequency f = 576 Hz is moving at 45 m/s away from you, while you are following towards it at 10 m/s. What frequency will you hear? (a) 415 Hz, (b) 524 Hz , (c) 546 Hz, (d) 580 Hz, (e) 680 Hz. 7. The figure to the right shows a standing wave on a rope that is oscillating at 200 Hz. What is the wave speed?

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