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Question

A cubical vessel of height 1m is full of water . the mini W.D in taking water out is

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Solution

Work = Change in Potential energy
= Final Potential energy - Initial Potential energy
= mgL - mgL/2. (CM concept)
= mgL/2
= (ALd gL)/2
= (1^2 * 1 * 10^3 * 10 * 1)/2
= 5 kJ


Hope it helps

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