Question

When the play button is pressed, a CD accelerates uniformly from rest to 460 rev/min in...

When the play button is pressed, a CD accelerates uniformly from rest to 460 rev/min in 2.0 revolutions.

If the CD has a radius of 7.0 cm and a mass of 15 g , what is the torque exerted on it?

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Answer #1

We know that work done by all forces will be equal to change in kinetic energy so,

Here,

Angular speed of disc​​​​​​

Moment of inertia of disc

Angular Displacement of disc

So,

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