Question

The diameter of wheels of cav is 80 cm.
How many revolutions does each will make
in 10 minutes, when the car is travelling
at 66 km/hr.​

Answer 1

Answer:

Given

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.

Hope it will help you