The wheels of a car of diameter 70 cm are. Making 550 revolutions per minute. Find the speed per hour.
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Answer:
diameter =70 cm ; radius=35 cm
one revolution=2πr
=2*22*35/7=220 cm so,
per minute the tyre travels distance
=550*220 cm ;=1210 cm
speed=distance/time
1210 cm/(60*60)
121 meter/3600 second
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