# An object with a mass of # 2 kg# is traveling in a circular path of a radius of #4 m#. If the object's angular velocity changes from # 1 Hz# to # 8 Hz# in # 3 s#, what torque was applied to the object?

##### 1 Answer

May 9, 2017

The torque was

#### Explanation:

The torque is the rate of change of angular momentum

The moment of inertiai is

For the object,

So,

The rate of change of angular velocity is

So the torque is