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A ring of radius 0.5 m and mass 10 kg is...

A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with angular velocity of 20 rad/s. Its KE is :-

A

10J

B

100J

C

500J

D

250J

Text Solution

Verified by Experts

The correct Answer is:
D
Rotational kinetic energy `(1)/(2) I omega^(2)= (1)/(2) ((1)/(2) MR^(2)) omega^(2)= (1)/(2) ((1)/(2) xx 10 xx (0.5)^(2)) (20)^(2)= 250J`
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