Question

Qid : 15 - diameter of a car wheel is 21 cm. A car driver moving at the speed of 66 km/hr takes 36 seconds to reach a destination. How many revolutions will the wheel make during the journey?

Answer 1

Answer:

1000 revolution's

Explanation:

distance=speed×time

66×36/3600

660 mts

revolution=Distance move/perimeter of the wheel

=660/(πD)

=1000

Answer 2

Answer:

22000 revolutions

Explanation:

diameter=21cm

radius=10.5cm

speed=66km/hr=66×1000×100/1×60×60=5500/3 cm/sec

in 36 seconds car covers 5500×12=66000cm

the circumference of the circle= distance covered in one Revolution

so

2πr= 2×22/7×10.5=3cm

so to cover 66000cm the wheel takes 66000/3 revolutions

that is

22000 revolutions

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