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A heat engine does 200 J of work per cycle while exhausting 400 J of waste heat. what is the engine's thermal efficiency?
The thermal efficiency of an engine is N=W/Q where W is the work done by the engine Q is the heat absorbed by the engine to do the work
In this problem, the work done by the engine is W=200 J, while the heat exhausted is Q=400 J, so the efficiency of the machine is N=200J/400J=0.50=50% I hope this helps!
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