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NEET 2020 (Phase 2) · Rotational Kinematics & Dynamics

Rotational Kinematics & Dynamics question from NEET 2020 (Phase 2)

Q44NEET 2020 · PHASE 2Easy

Rotational Kinematics & Dynamics

The angular speed of the wheel of a vehicle is increased from 360 rpm to 1200 rpm in 14 second. Its angular acceleration is,

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Answer: (b)

360 rpm $= 6$ rev/s $= 12\pi$ rad/s; 1200 rpm $= 20$ rev/s $= 40\pi$ rad/s
$\alpha = \frac{40\pi - 12\pi}{14} = 2\pi$ rad/s $^2$
So the answer is (b) $2\pi$ rad/s $^2$ .

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