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A swimming pool is an example of an open system. According to the law of conservation of energy, if swimmers add 12,000 J of thermal energy and the surrounding air removes 8,500 J of thermal energy, what is the total change in energy? A. A decrease of 8,500 J
B. A decrease of 3,500 J
C. An increase of 3,500 J
D. An increase of 20,500
Answers: 3
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