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A heat engine does 7190 J of work in each cycle while absorbing 13.8 kcal of heat from a high-temperature reservoir What is the efficiency in percent of this engine?
Wiki User
∙ 14y ago
The efficiency of a heat engine is given by
n = Wu / QH
Where
Wu - is the useful work (7190 J)
QH - Heat taken from the hot reservoir (13,8 x 4184 J)
1 cal = 4,184 J => 1 kcal = 1000 cal = 4184J
So n = 7190 / (13,8 x 4,184 x 1000) J
and since you want that in percent multiply the result by 100.
Wiki User
∙ 14y ago
Wiki User
∙ 14y ago5017 J = 5000 J (2 significant figures)
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