Starting from rest a 12 centimeter diameter compact disk, Physics

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Starting from rest a 12 centimeter diameter compact disk

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

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Physics: Starting from rest a 12 centimeter diameter compact disk

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