# The rate of rotation of a solid disk with a radius of #8 m# and mass of #5 kg# constantly changes from #2 Hz# to #17 Hz#. If the change in rotational frequency occurs over #3 s#, what torque was applied to the disk?

##### 1 Answer

May 13, 2017

The torque was

#### Explanation:

The torque is the rate of change of angular momentum

where

For a solid disc,

So,

The rate of change of angular velocity is

So the torque is