A griding stone in the form of a solid cylinder has a radius of 0.5 m and a mass 50 kg . Find
What torque will bring it from rest to an angular velocity of 300 rev/min in 10 s ?
(b) What is the kinetic energy when it is rotating at 300 rev/min ?

Explanation

To solve the problem step by step, we will break it down into two parts: (a) calculating the torque required to bring the grinding stone from rest to an angular velocity of 300 revolutions per minute (rev/min) in 10 seconds, and (b) calculating the kinetic energy when it is rotating at that angular velocity.

### Part (a): Finding the Torque

1. **Convert Angular Velocity from rev/min to rad/s**:
- The final angular velocity \( \omega_f \) is given as 300 rev/min.
- To convert this to radians per second:
\[
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