Starting from rest, a 12-cm-diameter compact disk takes

Chapter 18, Problem 58GP

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QUESTION:

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 . a. How much torque is applied to the disk? b. How many revolutions does it make before reaching full speed?

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QUESTION:

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 . a. How much torque is applied to the disk? b. How many revolutions does it make before reaching full speed?

ANSWER:

Solution Here we have first note down the given data: Radius of the disk=d/2=12 cm/2=0.060 m Initial angular velocity (w ) 0 0 rad/s Final angular velocity(w) = 2000 rpm,we must converted into SI units. w = (2000 rpm)(2/60) rad/s r =209.4 rad/s The compact dis

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