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

AIPMTAIPMT 1995Motion in a Plane

Solution:

Number of revolutions per minute $(n) = 120$.
Therefore angular speed ( $\omega$)
= $ \frac{ 2 \pi n}{ 60} = \frac{ 2 \pi \times 120}{ 60} = 4 \pi $ rad/s.