A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of 800 J is added to the process, the volume expands from 0.120 m3 to 0.200 m3. What is the change in its internal energy?
1. A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of 800 J is added to the process, the volume expands from 0.120 m3 to 0.200 m3. What is the change in its internal energy?
2. An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each cycle. What is its efficiency?
3. From Question 2, how much work does the engine do in three cycles?
4. A refrigerator has a coefficient of performance of 2.0. In each cycle it absorbs 3.4×104 J of heat from the cold reservoir. During each cycle, how much heat is released to the high-temperature reservoir?
5. During running, you lost 4.0×104 J of heat, and your internal energy also decreased by 1.6×105 J. How much work did you do in the match?
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