Question

diameter of the wheel of a bus is 1.4 the wheel makes 10 revolutions in 5 seconds The speed of the wheel in kilometre per hour is ​

Answer 1

Answer:

The diameter of the wheel of a car is 84 cm and the speed of a car is 72 km/h. How many revolutions made by the wheel in 11 minutes?

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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 revolution