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Unformatted text preview: fullwood (tf5349) QUIZ Rotation Catala (49033) 1 This printout should have 5 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points An electric motor rotating a workshop grind ing wheel at a rate of 139 rev / min is switched off. Assume constant angular deceleration of magnitude 1 . 55 rad / s 2 . How long does it take for the grinding wheel to stop? Correct answer: 9 . 391 s. Explanation: Let : i = 139 rev / min and = 1 . 55 rad / s 2 . Since w f = 0, f = i + t = 0 t = i = 139 rev / min 1 . 55 rad / s 2 parenleftbigg 2 rad 1 rev parenrightbiggparenleftbigg 1 min 60 s parenrightbigg = 9 . 391 s . 002 (part 2 of 2) 10.0 points Through what angle has the wheel turned before it finally comes to rest? Correct answer: 68 . 3479 rad. Explanation: Since w f = 0, f 2 = i 2 + 2 = 0 = i 2 2 = (139 rev / min) 2 2 ( 1 . 55 rad / s 2...
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This note was uploaded on 06/10/2010 for the course PHY 100 taught by Professor Pro.kiroshima during the Spring '10 term at Adelphi.
 Spring '10
 PRO.KIROSHIMA
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