SSC JE Mechanical Engineering 2017 Set 2 Paper

Question : 108 of 200

Marks: +1, -0

A bucket of water weighing 10 kg is pulled up from a 20 m deep well by a rope weighing 1 kg/m length, then the work done is ________.

Solution:

Total work done will be sum of work done to pull the bucket and work done required to pull the rope.

dW = (\W_\bucket + \W_\rope) xdx

dW = (10 + x)dx
W

=∫↖{20}↙{0}(10+x)dx

= 400 Kg-m

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