Question

The diameter of a wheel of a car is 0.75 m. if the car travels at an average speed of 14 m/s, find the
number of revolutions made by the wheel per minute, giving your answer correct to the nearest
whole number.​

Answer 1

Answer:

5000

Step-by-step explanation:

Diameter of car wheel is 84 cm

Circumference of the wheel = 2*pi*r

= 2*22*.42/7

= 2.64 meter

Speed of the car is 72 kmph

Speed in m/sec is 72*5/18 = 20 m/sec

Distance covered in 11 minutes = 20*11*60 = 13200 meter

Number of revolutions in 11 minutes = distance covered in 11 minutes / circumference of the wheel

= 13200/2.64

= 5000 revolutions