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Work Done against Gravity

Calculate the...

Question

Calculate the work done in raising a stone of mass 5 kg and specific gravity 3, lying at the bed of a lake through a height of 5 m.

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Solution

Calculate W app = mg(1- Ro of w/ Ro of m ) specific gravity given so mg(1-1/3)= 2 mg/3 Work done = Wapp* 5 m = 163 j

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