Again, the engine does 41,000 J of useful work. If it sinks 9,000 J of energy in the form of heat to its cold reservoir, what is the efficiency of this engine?

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For a particular heat engine, 3,000 J of energy goes in at 700 K and 2000 J comes out at 200 K. The rest of the energy is used work.What is the actual efficiency of this engine?

The correct option is A 0.33Amount of heat goes in the engine QH=3000 JAmount of heat rejected by the engine QR=2000 JThus work done by the engine W=QH−QR=3000−2000=1000 JActual efficiency of heat engine η=WQH=10003000=0.33

For a particular heat engine, 3,000 J of energy goes in at 700 K and 2000 J comes out at 200 K. The rest of the energy is used work.
What is the actual efficiency of this engine?

The correct option is A 0.33
Amount of heat goes in the engine $Q_{H} = 3000$ J
Amount of heat rejected by the engine $Q_{R} = 2000$ J
Thus work done by the engine $W = Q_{H} - Q_{R} = 3000 - 2000 = 1000$ J

Actual efficiency of heat engine $η = \frac{W}{Q_{H}} = \frac{1000}{3000} = 0.33$