问题描述：
(1 ) A 20kg sample of pure water at 40℃ is mixed with 20kg sample of pure water at 32℃,Using the average temperature of each sample,deternime the approximate net change in entropy of the total quantity of water.The apecific heat of pure water is 4186J/kg.K
（2）A nuclear power plant operates at 75 percent of its maximum theoretical efficency between temperatures of 660℃ and 360℃.If the plant produces electric energy at the rate of 1.1 GW,how much exhaust heat is discharged per hour?
（2）A nuclear power plant operates at 75 percent of its maximum theoretical efficency between temperatures of 660℃ and 360℃.If the plant produces electric energy at the rate of 1.1 GW,how much exhaust heat is discharged per hour?
问题解答：
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