Question

An old turntable for playing vinyl records rotates at 33 rpm (rotations per minute). Its angular velocity, w, is closest to which value? Select one: a. 0.03 rad/sec b.3.45 rad/sec c. 1.8 rad/sec d. 0.55 rad/sec

Answer 1

b. 3.45 rad/sec

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Solution :

Angular velocity = 33 rpm

Since one rotation = 2 $\pi$ radians

and 1 minute = 60 sec

This angular velocity = 33 x 2 x $\pi$ /60 rad/sec

= 3.45 rad/sec