懂英文进.The engine operates in a cycle between temperatures 700k and 400k.the heat input to the engine during each cycle is 2800J.What is the maximum possible work done by the engine in each cycle?

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懂英文进.
The engine operates in a cycle between temperatures 700k and 400k.the heat input to the engine during each cycle is 2800J.What is the maximum possible work done by the engine in each cycle?

thermal efficiency = 1- (T cold / T hot)
= 1 - 400/700
= 0.43
thermal efficiency = W / Qhot
0.43= W / 2800 J
w = 1204 J