A bucket is raised from a well by means of a rope which is wound round a wheel of diameter 77 cm. Given that the bucket ascends in 1 minute 28 seconds with a uniform speed of 1.1 m/s. Calculate the number of complete revolutions the wheel makes in raising the bucket
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Answer:
Diameter =77 cm
Radius =
2
D
=
2
77
cm =
200
77
m
Speed =1.1 m/s
Time =1 min 28 sec=88 sec
Distance can be completed as S×T=1.1×88=96.8 m
Circumference ⇒2×π×r=2×
7
22
×
200
77
=2.42 m
∴ No. of Revolution =
Circumference
Distance
=
2.42
96.8
=40
∴ No. of revolution ⇒ 40
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