$6.$

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SERCP$1112\mathrm{.}4.$P$\mathrm{.}037.$

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PRACTICE ANOTHER

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 $42\mathrm{.}0\%.$ How much mechanical power does the engine deliver if it absorbs $1\mathrm{.}45105$ J of energy each second from the hot reservoir?

kW