problem20_61

University Physics with Modern Physics with Mastering Physics (11th Edition)

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20.61: a) ) ln( 1 2 T T mc S = K. J 150 K) 293.15 K 5 K)ln(338.1 kg J kg)(4190 10 250 ( 3 = × = - b) K. J 120 K 15 . 393 K) 293.15 K K)(338.15 kg J kg)(4190 10 250 ( 3 element - = = = - × - - - T T mc S c) The sum of the result of parts (a) and (b) is K. J 30 system = S d) Heating a liquid is not reversible. Whatever the energy source for the heating element, heat is being delivered at a higher temperature
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Unformatted text preview: than that of the water, and the entropy loss of the source will be less in magnitude than the entropy gain of the water. The net entropy change is positive....
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