Question

A thin disc and a thin ring, both have mass Mand radius R. Both rotate about axes through their center of mass and are perpendicular to their smfaces at the same angular velocity. Which of the following is true ? (a) The ring has higher kinetic energy (b) The disc has higher kinetic energy (c) The ring and the disc have the same kinetic energy (d) Kinetic energies of bot~ the bodies are zero since they are not in linear motion

Answer 1

Explanation:

kinetic energy directly proportional to moment of inertia

and ring has greater moment of inertia than disc

so kinetic energy of ring is more than disc