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# If a fly wheel makes 120 revolutions per minute then its angular speed will be

$\begin {array} {1 1} (a)\;8 \pi \;rad/s & \quad (b)\;6 \pi \;rad/s \\ (c)\;4 \pi\; rad/s & \quad (d)\;2 \pi \;rad/s \end {array}$

$w= 2 n \pi$
$\quad= 2 \pi \times \large\frac{120}{60}\;$$rad/s$
$\quad=4 \pi$
Hence C is the correct answer.
edited May 26, 2014

+1 vote

+1 vote