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4. (10 points)You can turn coal into electricity with 30% efficiency,

3. (10 points) If that 30% in a coal-burning power plant is 75% of the best possible (Carnot) efficiency, and the plant exhausts its heat into a river at 10 deg C, how hot was the fire in deg C? actual efficiency = 30% = 0.30 = 75% of the best = 0.75 e Carnot ,

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