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Thermodynamics Test
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Thermodynamics Test
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25 Questions

1. In which of the following processes is no work done on or by the gas?
2. A copper rod has a diameter of 2 cm and a length of 0.5 m. It is placed against a heat source. The temperature of the rod increases from 25°C to 50°C. The thermal conductivity of copper is 390 J/s.m.°C. What is the rate of heat transfer into the copper rod?
3. A concrete slab of a sidewalk heats up in the Sun. The temperature changes from 20°C to 40°C. The coefficient of thermal linear expansion for concrete is 1.2 × 10−5 °C−1. What is the percentage change in the length of the slab?
4. The mass of an oxygen atom is 5 × 10−26 kg. What is the average speed of an oxygen molecule at room temperature (25°C)?
5. If 500 J of thermal energy is added to a gas in a cylinder and the temperature remains the same, then which of the following statements is true?
6. At a constant pressure, the volume of a gas triples from its original volume. Which of the following statements is true?
7. One mole of hydrogen gas has an internal energy of 4.3 kJ. What is the temperature of the gas?
8. If 500 J of work was done on a volume of gas in a container with a moveable piston at a constant atmospheric pressure, what was the change in gas volume?
9. A 20-kg crate slides horizontally on a floor at 0.5 m/s and comes to rest in 25 s. What is the rate of thermal energy transferred between the crate and the floor by friction?
10. You push on the piston of a gas cylinder with a constant force of 2,000 N and the piston adiabatically depresses by 1 m. What was the change in internal energy of the gas?
11. If the internal energy change during an isochoric process is 1,000 J, how much heat is transferred?
12. In an adiabatic process, 0.5 moles of gas at 1,000 K expand to reach a final temperature of 500 K. How much work was done?
13. On which of the following devices must work be done for it to achieve its function?
14. Two moles of oxygen gas are in a container with a movable piston at 25°C. The pressure is 6,400 Pa. What is the volume of the gas?
15. A concrete slab of a sidewalk heats up in the Sun. The temperature changes from 20°C to 40°C. The coefficient of thermal linear expansion for concrete is 1.2 × 10−5 °C−1. What is the percentage change in the length of the slab?
16. The mass of an oxygen atom is 5 × 10−26 kg. What is the average speed of an oxygen molecule at room temperature (25°C)?
17. You have 20 moles of a gas in a 1-m3 sealed container at 125°C. How many atmospheres of pressure are inside the container?
18. A heat engine has a 20 percent efficiency rating. If you put in 2 kJ of thermal energy, how much work will the engine do?
19. An ideal heat engine has an efficiency rate of 20 percent. If the heat reservoir has a temperature of 200°C, then what is the temperature of the heat sink?
20. Two moles of oxygen gas are in a container with a movable piston at 25°C. The pressure is 6,400 Pa. What is the volume of the gas?
21. You have 20 moles of a gas in a 1-m3 sealed container at 125°C. How many atmospheres of pressure are inside the container?
22. If you have 2 moles of gas at room temperature (25°C), then what is the internal energy of the gas?
23. A 20-kg crate slides horizontally on a floor at 0.5 m/s and comes to rest in 25 s. What is the rate of thermal energy transferred between the crate and the floor by friction?
24. A 1.0-m brass rod with a 1-cm radius gets heat transferred to it at a rate of 1 J/s. If the coefficient of linear thermal expansion is 110 J/s. m. °C, then what is the change in the rod’s temperature?
25. One mole of hydrogen gas has an internal energy of 4.3 kJ. What is the temperature of the gas?

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