A boy is cycling in such a way that the wheels of his bicycle are making 140 revolutions per minute.if the diameter of a wheel is 60cm,calculate the apeed in km ler hour at which the boy is cycling.
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Answered by
5
Revolution Per Minute = 140
Diameter = 60cm
radius= 60/2=30 cm
Speed = ?
Circumference = 2πr
=2×22/7×30
=188.57cm
Distance travelled in an hour = 60*140 per min*Circumference
=8400*188.57cm
=1583988cm
=15.83988km
Therefore, speed = 15.8 km per hour.
Diameter = 60cm
radius= 60/2=30 cm
Speed = ?
Circumference = 2πr
=2×22/7×30
=188.57cm
Distance travelled in an hour = 60*140 per min*Circumference
=8400*188.57cm
=1583988cm
=15.83988km
Therefore, speed = 15.8 km per hour.
Answered by
3
speed= distance/time
distance= no. of revolutions* circumference/ time
= 140*2*22/7*30/60*100
= 4.4 m/s.
Km/h= 4.4*5/18
=1.22Km/h.
distance= no. of revolutions* circumference/ time
= 140*2*22/7*30/60*100
= 4.4 m/s.
Km/h= 4.4*5/18
=1.22Km/h.
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