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Question
The diameter of a wheel of a bus is 90 cm which makes 315 revolutions per minute. Determine it's speed in kilometers per hour.(Use π=22/7)
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Solution
The wheel makes (315X60=) 18900 revolutions per hour.
So, it completes one revolution in 1/18900 hours.
Distance in one revolution= 2 X 22/7 X 45/100000 km (r = 90/2 = 45cm = 45/100000 km)
So, speed = (2 X 22/7 X 45/100000 km) / (1/18900 hours)
=[(22 X 9 X 27) / 100 ]km/h
= 53.46 km/hr
The wheel makes (315X60=) 18900 revolutions per hour.
So, it completes one revolution in 1/18900 hours.
Distance in one revolution= 2 X 22/7 X 45/100000 km (r = 90/2 = 45cm = 45/100000 km)
So, speed = (2 X 22/7 X 45/100000 km) / (1/18900 hours)
=[(22 X 9 X 27) / 100 ]km/h
= 53.46 km/hr
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