Rankers Physics
Topic: Rotational Motion
Subtopic: Rotational Kinetic Energy

A circular ring of wire of mass M and radius R is making n revolutions/sec about an axis passing through a point on its rim and perpendicular to its plane. The kinetic energy of rotation of the ring is given by
4π²MR²n²
2π²MR²n²
π²MR²n²/2
8π²MR²n²

Solution:

Rotational Kinetic Energy = ½ I ω²= ½(2MR²)(2πn)²= 4π²MR²n²

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