1. A heat engine takes in 900 J of heat from a high temperature reservoir and produces 300 J of work in each cycle. What is its efficiency?   Answer (33.0K)

2. An inventor claims to have developed an engine that takes in 1000 J of heat and produces 1500 J of work during each cycle. Comment on the validity of this claim.   Answer (30.0K)

3. A heat engine takes in 700 J of heat from a high temperature reservoir and rejects 500 J of heat to a lower temperature reservoir. How much work does the engine do in each cycle?   Answer (33.0K)

4. Calculate the efficiency of the engine in the previous problem.   Answer (34.0K)

5. An engine that has an efficiency of 25% takes in 200 J of heat during each cycle. Calculate the amount of work this engine performs.   Answer (34.0K)

6. Calculate the efficiency of a Carnot engine operating between temperatures of 900 K and 300 K.   Answer (35.0K)

7. Calculate the efficiency of a Carnot engine operating between temperatures of 400^o C and 100^o C.   Answer (36.0K)

8. What would be the efficiency of a Carnot engine operating with boiling water as one reservoir and a freezing mixture of ice and water as the other reservoir?   Answer (38.0K)

9. From time to time people suggest using the difference in the temperature of water at the surface of the ocean and that near the bottom of the ocean for operating a heat engine. Using 20^o C as the high temperature and 4^o C as the low temperature what is the efficiency of such a device?   Answer (38.0K)

10. A refrigerator uses 400 J of work to remove 200 J of heat from its contents. How much heat must it reject to its surroundings?   Answer (31.0K)