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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 13.10 | Entropy and the Second Law of Thermodynamics |
1) 500 g of water steam at 100°C are placed in thermal contact with some ice at 0°C. What is the change in the entropy in the universe? Take Lsteam = 2 224 000 J/kg.
Correct Answer: D
2) A heat engine of 80% efficiency is used to move an object by 500 m by applying a force of 2000 N. What is the total heat energy produced by the source during this process?
Correct Answer: C
3) A Carnot engine has an efficiency of 80%. It operates by using the atmosphere as a cold reservoir. If the temperature outside is 7°C, what is the maximum temperature in the hot reservoir of this engine?
Correct Answer: B
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