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

2 π r a d / s

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4 π^{2} r a d / s

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π r a d / s

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4 π r a d / s

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Solution

The correct option is C $4 π r a d / s$
Angular speed of a fly wheel, $W = 2 n Π$
$\Rightarrow W = 2 Π \times \frac{120}{60}$ rad/s
$\Rightarrow W = 4 Π$ rad/s
$∴$ Ans is D.

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