The diameter of a wheel is 40 cm. How many revolutions will it make in covering 176 m?
Diameter of wheel = 40 cm
Radius of wheel = r = 40/2 cm = 20 cm
Distance the wheel travels = 176 m = 17600 cm
In 1 revolution wheel travels 2πr distance
No. of revolutions a wheel makes = 
= 
= 140 revolutions
19