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Q.

The angular speed of a fly wheel making 120 revolutions/minute is

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a

2 $π$ rad/s

b

4 $π$ rad/s

c

$π$ rad/s

d

4 $π$ ² rad/s

answer is D.

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Detailed Solution

$\begin{array}{l} 1 rev / \min = \frac{π}{30} rad / \sec \\ ∴ 120 rev / \min = 120 \times \frac{π}{30} \\ = 4 πrad / s \end{array}$

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