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Unformatted text preview: takes 1 . 6 h to stop aFter the motor power is turned o³. The ²ywheel was originally rotating at 56 rpm. What was the initial rotation rate in radians per second? Correct answer: 5 . 86431 rad / s. Explanation: Let : f = 56 rpm . ω = (56 rpm) 2 π rev 1 min 60 sec = 5 . 86431 rad / s . 003 (part 2 of 2) 10.0 points How many revolutions does the ²ywheel make beFore it stops? Correct answer: 2688 rev. Explanation: Let : t = 1 . 6 h . The angular acceleration oF the ²ywheel is α =ω t , so the angle is θ = ω t + 1 2 α t 2 = ω t + 1 2 ±ω t ² t 2 = 1 2 ω t = 1 2 (5 . 86431 rad / s) (1 . 6 h) 3600 s 1 h 1 rev 2 π = 2688 rev ....
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This note was uploaded on 02/20/2011 for the course PHYS 1062 taught by Professor Mackie during the Spring '11 term at Temple.
 Spring '11
 MACKIE
 Physics

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