Question

MATHEMATICS
4. The wheels of a car are of diameter 80 cm cach. How many complete revolutions does
"bach wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?​

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.

Step-by-step explanation:

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Answer 2

Answer:

ok

Step-by-step explanation:

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