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1 Kg stone at 27^(@)C falls 100 m into ...

1 Kg stone at `27^(@)`C falls 100 m into a lake whose temperature is `27^(@)` C. Find the entropy charge of (a) the stone (b) the lake (c) the univers when
(i) stone is lowered reversibly
(ii) stone is dropped freely
Compare the loss of available energy in two cases

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