The rate of rotation of a solid disk with a radius of #4 m# and mass of #5 kg# constantly changes from #12 Hz# to #5 Hz#. If the change in rotational frequency occurs over #7 s#, what torque was applied to the disk?
1 Answer
Oct 11, 2017
The torque was
Explanation:
The torque is the rate of change of angular momentum
where
The mass of the disc is
The radius is
For the solid disc,
So,
And the rate of change of angular velocity is
So,
The torque is