Question

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 ​

Answer 1

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