Question

A grindstone has moment of inertia 50m.k.s units .a constant torque is applied and the grindstone is found to have a speed of 150 r.p.m 10 seconds after starting from rest find the torque

Answer 1

$$\tau=I\alpha=I\frac{\Delta \omega}{\Delta t}$$

$$\tau=50\frac{150(2\pi)}{10\cdot 60}=78.5\ Nm$$