# The rate of rotation of a solid disk with a radius of #1 m# and mass of #5 kg# constantly changes from #6 Hz# to #24 Hz#. If the change in rotational frequency occurs over #6 s#, what torque was applied to the disk?

##### 1 Answer

Oct 4, 2017

The torque was

#### Explanation:

The torque is the rate of change of angular momentum

where

For a solid disc,

The mass of the dics is

The radius of the disc is

So, the moment of inertia is

The rate of change of the angular velocity is

So,

The torque is