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How fast is a bicyclist traveling in miles per hour is his tires are 27 inches in diameter and his angular speed is 5pi radians per second

Respuesta :

5π rad/sec= 60 x 2.5 = 150 rpm. The bicycle travels 27π inches per revolution 
150 rpm = 150 x 27π in/min = (150 x 27π x 60)/(5280 x 12) = 12.05 mph 

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