10.53: a) ( 29 ( 29 ( 29 . m kg 955 .0 rev/min rad/s 30 rev/min 100 s0 . 2 m N0 . 5 2 ⋅ = ⋅ = ∆ ∆ = = π ω t τ α τ I b) Rather than use the result of part (a), the magnitude of the torque is proportional to α and hence inversely proportional to | | t ∆ ; equivalently, the magnitude of the change in angular momentum is the same and so the magnitude of the torque is again proportional
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