How many times turns the wheel of a passenger car in one second if car run at speed 100 km/h. Wheel diameter is d = 62 cm.

Correct result:

n =  14.2612


v=100 km/h=27.78 m/s o=2πr=πD=π62 cm=1.95 m  n=vo=27.781.95=14.2612

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