How many revolutions per second does each wheel make?

The diameter of each wheel on a vehicle is D cm. If the vehicle travels at a speed S km/hr, how many revolutions per second does each wheel make? Express your answer in terms of D and S.

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1 Answer

weel wide=d cm, so rim-leng=d*pi cm

kar speed=s km/our=s*1000 meter/out=100,000 cm/our

divide bi 3600 sek/our tu get 27.7777777 s cm/sek

rotate speed=27.7777s / (pi*d)

pi=3.14159265..., 27.7777/3.14159265=8.841941293(s/d)
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