problem09_08

University Physics with Modern Physics with Mastering Physics (11th Edition)

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9.8: (a) The angular acceleration is positive, since the angular velocity increases steadily from a negative value to a positive value. (b) The angular acceleration is 2 0 s rad 00 . 2 s 00 . 7 s) rad 00 . 6 ( s rad 00 . 8 = - - = - = t ω ω α Thus it takes 3.00 seconds for the wheel to stop ) 0 ( = z ω . During this time its speed is decreasing. For the next 4.00 s its speed is increasing from s rad
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Unformatted text preview: 8.00 to s rad + . (c) We have rad. 7.00 rad 49.0 rad . 42 s) (7.00 ) s rad 00 . 2 ( s) (7.00 s) rad 00 . 6 ( 2 2 2 1 2 2 1 + = +-= +-+ = α + ϖ + θ = t t θ Alternatively, the average angular velocity is s rad 00 . 1 2 s rad 00 . 8 s rad 00 . 6 = +-Which leads to displacement of 7.00 rad after 7.00 s....
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This document was uploaded on 02/04/2008.

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