Question: Starting from rest, a 1 2 - cm - diameter compact disk takes 2 . 9 s to reach its operating angular velocity of 2

Starting from rest, a 12-cm-diameter compact disk takes 2.9 s to reach its operating angular velocity of 2200 rpm. Assume that the angular acceleration is constant. The disk's moment of inertia is 2.5\times 10-5 kg-m?.a. How much torque is applied to the disk?b. How many revolutions does it make before reaching full speed?

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