Question

A heat engine receives 7.0 x 10^3 J of heat and loses 3.0 x 10^3 J in each cycle. What is the efficiency?

1-30%

2-43%

3-57%

4-70%

5-100%
Eff. = Eo/Ei = (7000-3000)/7000 = 0.57 =
57%

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