# What torque would have to be applied to a rod with a length of #4 m# and a mass of #3 kg# to change its horizontal spin by a frequency of #12 Hz# over #1 s#?

##### 1 Answer

Jan 27, 2018

Torque (

Now,moment of inertia of a rod w.r.t its one end along an axis perpendicular to its plane is

Now, rate of change in angular velocity =

So,