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Water is drawn from a well in a 5kg drum...

Water is drawn from a well in a `5kg` drum of capacity `55L` by two ropes connected to the top of the drum. The linear mass density of each rope is `0.5kgm^-1`. The work done in lifting water to the ground from the surface of water in the well `20m` below is
`[g=10ms^-2]`

A

`1.4xx10^4J`

B

`1.5xx10^4J`

C

`9.8xx10xx6J`

D

`18J`

Text Solution

Verified by Experts

The correct Answer is:
A
Work done in lifting water and drum is
`60xx10xx20J=12000J`
Total mass of ropes `=40xx0.5kg=20kg`
Work done in the case of ropes is
`20xx10xx10=2000J`
Total work done `=14000J`
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