the diameter of a cycle wheel is 21 cm . how many revolutions will it make in moving a distance of 66 cm ?
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Given, speed of the car = 66 km/h and diameter of wheel = 21 cm
So, radius of wheel (r) = 21/2 = 10.5 cm
As we know, Distance = speed × time
Distance covered by car in 36 sec = 66 × 5/18 × 36 = 660 meter
As we know, circumference of circle = 2πr
Thus, Circumference of wheel = 2 × 22/7 × 21/2 = 66 cm
∴ No of revolutions = distance/(circumference of wheel) = (660 × 100)/66 = 1000
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