A ceiling fan has 17 -inch blades (so the radius of the circular fan is 17 inches). Suppose the linear speed of the tip of a blade is 13 feet per second.
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13 feet=13×12=156 inches. The angular speed is 156/17=9.7647 radians per second. One revolution is 2π=6.2832 radians. 9.7647/6.2832 is about 1.46 revs/sec.

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