The angular speed of a flywheel making 120 rev/min is

π

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π

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π

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π

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Solution

The correct option is C 4 $π$
$\begin{matrix} angular speed = 120 rev / min Total angle subtended = 120 \times 2 π per min \begin{matrix} = 240 π rad per min = \frac{240 π}{60} rad / s e c \Rightarrow w = 4 π \end{matrix} \end{matrix}$ r

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