A bicycle with wheel of diameter 70cm is turning at 5 revolutions per second. Find the speed of a point on the rim of the wheel, giving your answer in km/h.
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diameter = 49cm;
radius = diameter/2 = 24.5cm;
circumference = 2πr ≈ 153.94 = 154cm
1 revolution = 154cm
50 revolution = 7700cm = 77m
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