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NEET 1988 (AIPMT) · Rotational Kinetic Energy, Work & Power

Rotational Kinetic Energy, Work & Power question from NEET 1988 (AIPMT)

Q56NEET 1988 · AIPMTEasy

Rotational Kinetic Energy, Work & Power

A ring of mass $m$ and radius $r$ rotates about an axis passing through its centre and perpendicular to its plane with angular velocity $\omega$ . Its kinetic energy is

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Answer: (a)

Ring about its central perpendicular axis: $I = mr^2$
$K = \frac{1}{2}I\omega^2 = \frac{1}{2}mr^2\omega^2$
So the answer is (a) $\frac{1}{2}mr^2\omega^2$ .

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