Question

A motorcar is running at the rate of 66 km per hour. Each
of its wheels makes 500 revolutions per minute. Find the
radius of the wheel.
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Answer 1

Answer:

0.35m or 35cm

Step-by-step explanation:

the car travels with a speed of 66kmph therefore in 1 minute or 60 seconds it travels 66*5/18*60 = 1100m

the distance travelled by the wheel in one minute is equal to the distance covered by the curcumference of the wheel in 500 revolutions

i.e. 500*2πr = 1000πr

the distance travelled by the car will be equal to distance covered by the wheel

therefore 1000πr = 1100m

on solving r = 0.35 m or 35cm

thank you....