What torque would have to be applied to a rod with a length of #4 m# and a mass of #2 kg# to change its horizontal spin by a frequency #9 Hz# over #2 s#?
1 Answer
Apr 3, 2018
The torque for the rod rotating about the center is
The torque for the rod rotating about one end is
Explanation:
The torque is the rate of change of angular momentum
The mass of the rod is
The length of the rod is
The moment of inertia of a rod, rotating about the center is
The rate of change of angular velocity is
So the torque is
The moment of inertia of a rod, rotating about one end is
So,
The torque is