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NEET 2022 (Phase 1) · Rotational Kinematics & Dynamics

Rotational Kinematics & Dynamics question from NEET 2022 (Phase 1)

Q29NEET 2022 · PHASE 1Easy

Rotational Kinematics & Dynamics

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s2 is

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Answer: (b)

1200 rpm $= 20$ rev/s $= 40\pi$ rad/s; 3120 rpm $= 52$ rev/s $= 104\pi$ rad/s
$\alpha = \frac{104\pi - 40\pi}{16} = \frac{64\pi}{16} = 4\pi$ rad/s $^2$
So the answer is (b) $4\pi$ .

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