One of the most efficient engines ever built is a coal-firedsteam turbine in the Ohio valley, driving an electric generator asit operates between 1870°C and 430°C.
(a) What is its maximum theoreticalefficiency?
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Your answer differs from the correct answerby 10% to 100%.%

(b) Its actual efficiency is 42.0%. How much mechanical power doesthe engine deliver if it absorbs 1.9105 J of energy each second from the hotreservoir?
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