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A power plant is operating at a maximum efficiency of 50%. The plant's boiler is operating at a temperature of 700 K with waste heat

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A power plant is operating at a maximum efficiency of 50%. The plant's boiler is operating at a temperature of 700 K with waste heat discarded at temperature 250 K. What is the efficiency of the plant, and the boiler's operating temperature if the efficiency is to be increased to 45%

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