One of the most efficient engines ever built is a coal-fired steam turbine engine in the ohio river valley, driving an electric generator as it operates between 1,870°c and 430°c.a. What is its maximum theoretical efficiency?b. Its actual efficiency is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.60 ✕ 10^5 J of energy each second from the hot reservoir?