Starting from rest, a 12 centimeter diameter compact disk takes 2.6 second to reach its operating angular velocity of 1915 rpm. Suppose that the angular acceleration is constant. The disk's moment of inertia is 2.5 x 10-5 kg·m2.
(a) Find how much torque is applied to the disk?
N·m
(b) Find how many revolutions does it make before reaching full speed?
revolutions