Answer to Question #341205 in Mechanics | Relativity for Dejene

Question

A solid cylinder of mas 4kg and radius 40cm rotates about its axis with a frequency of 1/pi what is its rotational kinetic energy?

Answer 1

$I=\frac{mr^2}2,$

$\omega=2\pi\nu=2,$

$E=\frac{I\omega^2}2=0.64~J.$