the radius of each wheel of a car is 18 inches. if the wheels are turning at the rate of 3 revolutions per second, how fast is the car moving?
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1 Answer

One revolution per second is 36π in/sec, so 3rps=108π in/sec, the speed of the car in in/sec.

In 1 hr the car moves 108π×3600 inches/hr=108π×100 yards/hr=10800π/1760 mph=19.28mph approx.

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