Question: Starting from rest, a 1 2 - cm - diameter compact disk takes 3 . 0 s to reach its operating angular velocity of 2

Starting from rest, a 12-cm-diameter compact disk takes 3.0 s to reach its operating angular velocity of 2000 rpm . Assume that the angular acceleration is constant. The disk's moment of inertia is 2.5105kgm2.
a. How much net torque is applied to the disk?
b. How many revolutions does it make before reaching full speed?

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