homework 29-solutions (3)

# homework 29-solutions (3) - klare (alk736) homework 29...

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Unformatted text preview: klare (alk736) homework 29 Turner (58220) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A weight suspended from a spring is seen to bob up and down over a distance of 19 cm twice each second. What is its frequency? Correct answer: 2 Hz. Explanation: Let : n = 2 . freq = 2 bobs 1 second = 2 Hz . 002 (part 2 of 3) 10.0 points What is its period? Correct answer: 0 . 5 s. Explanation: period = 1 freq = 1 2 Hz = . 5 s . 003 (part 3 of 3) 10.0 points What is its amplitude? Correct answer: 9 . 5 cm. Explanation: Let : d = 19 cm . The amplitude is the distance from the equilibrium position to maximum displace- ment: 1 2 d = 1 2 (19 cm) = 9 . 5 cm . 004 10.0 points The oscillation of a mass-spring system x = x m cos( t + ) , where x m is a positive number. At time t = 0, the mass is at the equilibrium point x = 0 and it is moving with positive velocity v . What is the phase angle ? 1. = 3 4 2. = 3 2 correct 3. = 1 2 4. = 0 5. = 6. = 7 4 7. = 2 8. = 5 4 9. = 1 4 Explanation: Since the initial position is x = 0, we know that cos( ) = 0, so = 1 2 , 3 2 , 5 2 ,... . The velocity can be found as v = dx dt =- x m sin( t + ) ....
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## This note was uploaded on 11/03/2010 for the course PHYSICS 303 taught by Professor Shih during the Spring '10 term at University of Texas at Austin.

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homework 29-solutions (3) - klare (alk736) homework 29...

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