One of the most efficient engines built so far has the, Physics

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One of the most efficient engines built so far has the

One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C, exhaust temperature = 430°C, 7.0 x 10^9 cal of fuel produces .94 x 10^10 J of work in one hour. What is the actual efficiency of this engine?

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