The wheels of a car have a diameter of 80, cm | vedclass

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(A) Diameter of the wheel $= 80\, cm$.Radius $(r)$ of the wheel $= 40\, cm$.Circumference of the wheel $= 2\pi r = 2 	imes \frac{22}{7} 	imes 40 = \

Vedclass · Accepted Answer

$4375$

Vedclass · Answer

(A) Diameter of the wheel $= 80\, cm$.Radius $(r)$ of the wheel $= 40\, cm$.Circumference of the wheel $= 2\pi r = 2 	imes \frac{22}{7} 	imes 40 = \frac{1760}{7}\, cm$.Speed of the car $= 66\, km/h = \frac{66 	imes 100000\, cm}{60\, min} = 110000\, cm/min$.Distance travelled in $10\, minutes = 110000 	imes 10 = 1100000\, cm$.Let the number of revolutions be $n$.$n 	imes 	ext{Circumference} = 	ext{Total distance}$.$n 	imes \frac{1760}{7} = 1100000$.$n = \frac{1100000 	imes 7}{1760} = \frac{110000 	imes 7}{176} = 4375$.Thus,each wheel makes $4375$ complete revolutions.

The wheels of a car have a diameter of $80\, cm$ each. How many complete revolutions does each wheel make in $10\, minutes$ when the car is travelling at a speed of $66\, km/h$? [Use $\pi = \frac{22}{7}$]

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