Question

A ring of radius r and mass m rotates about the axis passing through the centre and perpendicular to its plane. The kinetic energy is ............... .
(A) 1/2 mr²ω²
(B) 1/2 mrω²
(C) mr²ω²
(D) mrω²

Answer 1

Answer:

Acc to rotational motion of dynamics,

KE = 1/2 I W2

I =mr2

therefore, KE = 1/2 mr2w2

answer is option( A )