ch10-p009 - 9. We assume the sense of initial rotation is...

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9. We assume the sense of initial rotation is positive. Then, with ω 0 = +120 rad/s and = 0 (since it stops at time t ), our angular acceleration (‘‘deceleration’’) will be negative- valued: α = – 4.0 rad/s 2 . (a) We apply Eq. 10-12 to obtain t . 0 2 0 120 rad/s 30 s. 4.0 rad/s tt ωω α =+ ¡ == (b) And Eq. 10-15 gives 3 0 11 ( ) (120 rad/s 0)(30s) 1.8 10 rad.
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