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oldmidterm 04

# oldmidterm 04 - klare(alk736 oldmidterm 04 Turner(58220...

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klare (alk736) – oldmidterm 04 – Turner – (58220) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A particle oscillates harmonically x = A sin( ω t + φ 0 ) , with amplitude 22 m, angular frequency π s - 1 , and initial phase π 3 radians. Every now and then, the particle’s kinetic energy and potential energy happen to be equal to each other ( K = U ). When does this equality happen for the first time after t = 0? 1. 0.2238 s 2. 0.7615 s 3. 0.8623 s 4. 0.5267 s 5. 0.3467 s 6. 0.6547 s 7. 0.4167 s 8. 0.9967 s 9. 0.1294 s 10. 0.5884 s 002 10.0 points Longitudinal sound waves cannot propagate through 1. a vacuum 2. steam 3. solids 4. liquids 5. gases 6. wet sand 003 10.0 points At t = 0, a transverse wave pulse in a wire is described by the function y = 5 e - x 2 / 2 , where x and t are given in SI units. Which function describes this wave if it is traveling in the negative x direction with a speed of 4 . 5 m / s? 1. y = 5 e - x 2 / 2 - 4 . 5 t 2. y = 5 e - x 2 / 2 + 4 . 5 t 3. y = 5 e - x 2 / 2 4. y = 5 e - ( x 2 - 4 . 5 t ) / 2 5. y = 5 e - ( x - 4 . 5 t ) 2 / 2 6. y = 5 e - ( x 2 +4 . 5 t ) / 2 7. y = 5 e - ( x +4 . 5 t ) 2 / 2 004 10.0 points Two harmonic waves are described by y 1 = A 0 sin(4 x - 3 t ) , y 2 = A 0 sin(4 x - 3 t - φ ) . A 0 = 2 cm, φ = 0 . 4. What is the amplitude of the resultant wave? Answer in units of cm. 005 10.0 points A pulse moves on a string at 1 m/s, traveling to the right. At point A , the string is tightly clamped and cannot move. 1 m/s 1 m A

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klare (alk736) – oldmidterm 04 – Turner – (58220) 2 Which of the following shows how the string would look soon after 2 seconds? 1. A 2. A 3. A 4. A 5. A 6. A 7. A 8. A 006 10.0 points Suppose that you hear a clap of thunder 18 . 3 s after seeing the associated lightning strike. How far are you from the lightning strike? The speed of sound waves in air is 337 m / s and the speed of light in air is 3 × 10 8 m / s.
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