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# [email protected]@!#[email protected] - Physics 1C Spring 2011 Quiz 1 Version A...

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Physics 1C Spring 2011: Quiz 1 Version A 1 01.06.11 Closed book. No work needs to be shown for multiple-choice questions. 1 . Consider a mass on a spring that is undergoing simple harmonic motion. In this simple harmonic motion system, the magnitude of the acceleration is greatest when: a. the displacement is maximum. b. the displacement is zero. c. the speed is maximum. d. the force is zero. e. the speed is exactly half of its maximum value. 2 . In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression: x(t) = (7.5 cm) cos(4.0 t + π /2), where x is in centimeters and t is in seconds. At t = 0 seconds, the magnitude of the velocity of the piston is: a. zero. b. 7.5 cm/s. c. 30 cm/s. d. 120 cm/s. e. 0.21 cm/s. 3 . A pendulum consists of a massive bob at the end of a string (as shown to the right). If the mass of the bob is doubled, what happens to the period of the pendulum? a. The period of the pendulum will decrease.

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