A particular power plant operates with a heat-source reservoir at 350°C and a heat- sink reservoir at 30°C. It has a thermal efficiency equal to 55% of the Carnot-engine thermal efficiency for the same temperatures. (a) What is the thermal efficiency of the plant? (b) To what temperature must the heat-source reservoir be raised to increase the ther- mal efficiency of the plant to 35%? Again 7 is 55% of the Carnot-engine value.

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