Question

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:

hii I think that it helps you

Step-by-step explanation:

Diameter of wheel (D)=80 cm

Radius (r)=

2

80

=40 cm.

1 complete revolution of wheel = Circumference of wheel (C)

C=2πr=2π×40=80π cm

C=0.8π m

Speed of the car =66 km / hr.=

60

66×1000

m/ min.

∴ Speed of the car =1100 m / min.

Therefore, in 10min., the car will travel a distance of 1100×10=11000 m

No. of revolutions of wheel =

0.8π

11000

=

0.8×22

11000×7

=4375

Each wheel of the car makes 4375 complete revolutions in 10 min.