The radius of a wheel of a car is 21 , cm. If | vedclass

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(D) The distance covered in $1$ rotation is equal to the circumference of the wheel.Circumference $= 2 \pi r = 2 	imes \frac{22}{7} 	imes 21 = 132 \

Vedclass · Accepted Answer

$63.36$

Vedclass · Answer

(D) The distance covered in $1$ rotation is equal to the circumference of the wheel.Circumference $= 2 \pi r = 2 	imes \frac{22}{7} 	imes 21 = 132 \, cm$.Distance covered in $1$ minute $= 800 	imes 132 \, cm = 105600 \, cm$.Distance covered in $1$ hour ($60$ minutes) $= 105600 	imes 60 \, cm = 6336000 \, cm$.To convert centimeters to kilometers,we divide by $100$ (to get meters) and then by $1000$ (to get kilometers).Speed $= \frac{6336000}{100 	imes 1000} \, km/h = 63.36 \, km/h$.Thus,the speed of the car is $63.36 \, km/h$.

The radius of a wheel of a car is $21 \, cm$. If it makes $800$ rotations per minute,find the speed of the car in $km/h$.

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