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Starting from rest, a 12-cm-diameter compact disk takes 3.2 s to reach its operating angular velocity...

Starting from rest, a 12-cm-diameter compact disk takes 3.2 s to reach its operating angular velocity of 2500 rpm . Assume that the angular acceleration is constant. The disk's moment of inertia is 2.5×10−5kgm2.

How much torque is applied to the disk?

How many revolutions does it make before reaching full speed?

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