The angular speed of a flywheel making 120 revolutions/minute is:

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Accepted Answer

1.  **Identify Frequency:** The flywheel makes 120 revolutions per minute. The frequency ($v$) in revolutions per second is:
    $v = \frac{120}{60} = 2 	ext{ rev/s}$ .
2.  **Formula:** The angular speed ($\omega$) is related to the frequency ($v$) by the formula:
    $\omega = 2\pi v$ .
3.  **Calculation:** Substituting the value of $v$:
    $\omega = 2\pi(2) = 4\pi 	ext{ rad/s}$.

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