A CD has a diameter of 9.0 cm. If the CD is rotating at a constant angular velocity of 15.0 radians per second, what is the frequency of the rotational motion (Hz)?What is the frequency of the rotational motion?frequency = angular velocity in cycles per second...
or w = 2Pi freq
f= 15 rad /s * 1 cycle/2Pi rad = 15/2/3.14 ~ 2.5HzWhat is the frequency of the rotational motion?Since it's about angular velocity, in radians per second. It's easy to translate these to Hz, simply by dividing rad/sec by 2 and then divide by pi (~3.14).
So
15/2/3.14 = 2.388 or 2.4 HZ
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