Question

te diameter of a wheel of a car is 0.75 m. If the car travels at an average speed of
os find the number of revolutions made by the wheel per minute, giving your
mwer correct to the nearest whole number. (Take n to be 3.142.)​

Answer 1

Answer:

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