Wheel

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 =  14.261

Solution:

v=100 km/h=27.78 m/s o=2πr=πD=π⋅62 cm=1.95 m  n=vo=27.781.95=14.261v = 100 \ km/h = 27.78 \ m/s \ \\ o = 2\pi r = \pi D = \pi \cdot 62 \ cm = 1.95 \ m \ \\ \ \\ n = \dfrac{v}{o} = \dfrac{ 27.78 }{ 1.95} = 14.261

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