# What torque would have to be applied to a rod with a length of #5 m# and a mass of #2 kg# to change its horizontal spin by a frequency of #7 Hz# over #3 s#?

##### 1 Answer

Jan 22, 2018

#### Explanation:

Torque is defined as the rate of change in angular momentum,

i.e

Now,moment of inertia(

so,its

Now,its rate of change in angular velocity is

So,torque acting is