22 points question! A wheel is of diameter 70 cm. If it makes 500 revolutions in 5 minutes, find its speed in km/h.
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Since the diameter of the wheel is 70m, its radius is 35m.
In one revolution, the wheel covers the distance of one circumference.
Circumference of the wheel of radius 35m
=2×22/7×35
=220m
Distance travelled in 500 revolutions =500×220m
=110000m
Speed = Time/Distance
= 110000m/5 min
= 110000/5×60seconds
=18/3 m/s
m/s can be converted to km/hr using the formula m/s ×3.6= km\hr
Now, 18/3×3.6=13.2km/hr
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