Question

1. What is the purpose of a constant volume gas thermometer. How does it work?

2. What is the difference, if any, between a isothermal and adiabatic thermodynamic process. Draw them on a pV diagram.

3. Does the First Law of Thermodynamics apply to solids and liquids? Why or why not.

4. What is the most important heat transfer mechanism on earth where there is an atmosphere? Explain how this can cool a nuclear or coal fired power plant, and is also used often with heat pumps for buildings.

5. What is the most important heat transfer mechanism in space, where there is no atmosphere? Because of this, what must be done in space for heat control?

1. A machinist bores a hole 2.000 cm in diameter in a brass plate at a temperature of 20 C. What is the diameter of the hole when the temperature of the plate is increased to 200C? Assume the expansion coefficient remains constant.

2. Prove that the temperature of -40C and -40F are the same.

3. (EC) The cross section of a steel rod is 10 cm². What is the least force that will prevent it from contacting while cooling from 520 C to 20 C?

4. A 125 g sample of lead at 85.0 C and a 320 g sample of silver at 34.0 C are added to 0.500 kg of water at room temperature (22.0 C) in an insulated container. Assuming the system is thermally insulated, what is the final equilibrium temperature?

5. You bought a new electric teakettle. The manufacturer claims that the teakettle’s output is 5.2 kW. You decide to test it by heating one liter (1 L) of water. The water is initially at room temperature (22C) and in 3 minutes it reaches the boiling point. What do you make of the manufacturer’s claim?

6. What is the energy required to turn an ice cube of mass 45.0 g and temperature

-10C into steam at 100 C.

7. An insulated cup of water (145g water) at room temperature (20C) is warmed by a 25 g sample of aluminum at 100C and cooled by a 40g ice cube at 0C. What is the final temperature of the water?

8. A thermodynamic cycle is shown below {where the coordinates of Point A are

(0.1m³, 5.0 E5 Pa) , Point B (0.5 m³, 1.0E5 Pa) and Point C (0.1 m³, 1.0 E5 Pa)} for an ideal gas in a piston. The system changes state from ABCA. A) what is the total work done by the gas during this cycle? B) How much heat is transferred? C) Does heat flow into or out of the system?

9. An ideal gas undergoes a change in state from A to C via two paths 1)AC directly (straight line) and 2) A to B then C as shown below. The coordinates on the PV diagram are: A (4.00 m³, 4.00 Pa), B ( 4.00m³ , 8.00 Pa) and C ( 16.00 m³ , 8.00 Pa).

a) Along which path is the least amount of work done by the gas?

b) If the thermal energy of the gas at Point A is 12J, and the heat transferred to the gas along path AC is 220J , find the thermal energy of the gas at Point C.

c) If the thermal energy of the gas at B is 25 J , find the amount of heat added to the gas to change ts state from A to B.

10. An insulated container holds 100 g of water at 30 C. A 50 g ice cube at 0C is dropped into the water and no heat is allowed to enter or leave the ice water container. What is the final temperature and thermodynamic state of the system after it comes to equilibrium.

Answer 1

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