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NEET 2016 (Phase 2) · Rotational Kinetic Energy, Work & Power

Rotational Kinetic Energy, Work & Power question from NEET 2016 (Phase 2)

Q49NEET 2016 · PHASE 2Medium

Rotational Kinetic Energy, Work & Power

Two rotating bodies A and B of masses m and 2m with moments of inertia $I_A$ and $I_B$ ( $I_B$ > $I_A$ ) have equal kinetic energy of rotation. If LA and LB be their angular momenta respectively, then

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Answer: (c)

$L = \sqrt{2IK}$ ; equal $K$ gives $L \propto \sqrt{I}$
$I_B > I_A \Rightarrow L_B > L_A$
So the answer is (c) $L_B > L_A$ .

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