Question

a wheel, 14cm in diameter, makes 3000 revolutions per minute. find its speed in m/sec

Answer 1

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Answer 2

The diameter of the wheel is 14cm.

Circumference = pi × diameter
= 22/7 × 14cm
= 22×2cm
= 44cm

1min = 60secs

In 1min the wheel can make 3000 revolutions.

In 1min = 3000
60secs = 3000
1sec = 3000/60
1sec = 500

In 1 sec it make 500 revolutions.
44cm = 4.4m
Distance covered in 500 revolutions = 4.4m× 500 = 22m

It's speed is 22m/sec.