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A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during the engine during each cycle is 2800 J. What is the maximum possible work done by the engines in each cycle? A.) 1200 J B.) 1600 J C.) 2100 J D.) 2800 J E.) 4400 J

First of all, is this a scientific discovery? And second of all, can someone give me a brief explanation of what it is and how it has affected people's lives? No copy and pastes please!