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MHT CET 2021 (22 Sep, Shift 1) · Rotational Kinetic Energy, Work & Power

Rotational Kinetic Energy, Work & Power question from MHT CET 2021 (22 Sep, Shift 1)

Q35MHT CET 2021 · 22 SEP · SHIFT 1Medium

Rotational Kinetic Energy, Work & Power

Two rotating bodies $P$ and $Q$ of masses ' $m$ ' and ' $2m$ ' with moment of inertia $I_P$ and $I_Q \, (I_Q > I_P)$ have equal Kinetic energy of rotation. If $L_P$ and $L_Q$ be their angular momenta respectively then

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Answer: (d)

$L = \sqrt{2IK}$ ; equal $K$ gives $L \propto \sqrt{I}$
$I_Q > I_P \Rightarrow L_Q > L_P$
So the answer is (d) $L_Q > L_P$ .

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