Question

4) The wheels of a car are of diameter 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 per hour ?​

Answer 1

Answer:

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Answer 2

Answer:

Radius of wheel= 80/2 = 40cm

∴ The distance travelled in one revolution is = 2πr = 2 x 22/7 x 40 = 1760/7 cm.

 

speed of car= 66km/hr= 66 x 1,00,000/60 cm/min = 1,10,000 cm/min.

distance covered by car in 1 min = 1,10,000cm

distance covered by car in 10min =  110,000 x 10 = 11,00,000cm.

number of complete revolution =

               distance covered in 10min / distance covered in one revolution.

= 11,00,000/ 1760/7 

                      = 11,00,000/1 x 7/1760 = 4375 revolutions.

Hence, in 10min each wheel of car makes 4375 revolutions.