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One of the Most Efficient Engines Built So Far Has

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One of the most efficient engines built so far has the following characteristics:
combustion chamber temperature = 1900°C
exhaust temperature = 430°C
7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour,where 1 cal = 4.19 J
(a)What is the actual efficiency of this engine?
(b)What is the Carnot efficiency of the engine?
(c)What is the power output of this engine?


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