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Chapter 12: Q. 27 (page 331)

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 2.5×10−5kgm2.

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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