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OpenStudy (anonymous):
A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine? (I don't want an answer, but how to do it, by finding the percentage.)
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OpenStudy (festinger):
I cannot remember the derivation, but the problem is most likely asking you calculate using the carnot efficiency. http://en.wikipedia.org/wiki/Thermal_efficiency#Carnot_efficiency
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