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MHT CET 2024 (15 May, Shift 1) · Rotational Kinetic Energy, Work & Power

Rotational Kinetic Energy, Work & Power question from MHT CET 2024 (15 May, Shift 1)

Q20MHT CET 2024 · 15 MAY · SHIFT 1Easy

Rotational Kinetic Energy, Work & Power

If the angular velocity of a body rotating about the given axis increases by $20\%$ , then its kinetic energy of rotation will increase by

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Answer: (c)

$K = \frac{1}{2}I\omega^2$ , so $K \propto \omega^2$ for the same axis.
$\omega' = 1.2\omega \Rightarrow K' = 1.44K$
Increase $= 44\%$
So the answer is (c) $44\%$ .

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