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Unformatted text preview: Chapter 10, Thermal Physics C HAPTER 10 Conceptual Problems C1. Metal lids on glass jars can often be loosened by running them under hot water. Why is this? a. The hot water is a lubricant. b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal. c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection. d. This is just folklore. C2. Why do vapor bubbles get larger in boiling water as they approach the surface? a. They only appear to get larger, this being a magnification effect due to looking through the water. b. The bubbles pressure increases as they rise. c. The pressure in the water decreases as the bubble moves toward the surface. d. Bubbles always get bigger after they form. C3. Suppose the pressure of 20 g of an ideal monatomic gas is tripled while its volume is halved. What happens to the internal energy of the gas? a. It stays the same, as the described changes do not involve internal energy. b. It increases. c. It decreases. d. This depends on the molecular weight of the gas involved, thus this is indeterminate. C4. The temperature of a quantity of ideal gas in a sealed container is increased from C to 273 C . What happens to the rms speed of the molecules of the gas as a result of this temperature increase? a. It does not change since rms speed is independent of temperature. b. It increases but it less than doubles. c. It doubles. d. It quadruples. C5. The noble gases, listed by increasing molecular weight, are He, Ne, Ar, Kr, Xe, and Rn. If samples of 1 mole each of these gases are placed in separate containers and heated to 300 K, which gas has the greatest internal energy and the molecules of which gas have the highest rms speed? a. The He has the greatest internal energy, and the Rn has the greatest rms speed. b. The Rn has the greatest internal energy, and the He has the greatest rms speed. c. All the gases have the same internal energy, and the Rn has the greatest rms speed. d. All the gases have the same internal energy, and the He has the greatest rms speed. 145 Chapter 10, Thermal Physics 10.1 Temperature and the Zeroth Law of Thermodynamics 10.2 Thermometers and Temperature Scales 1. Which best describes the relationship between two systems in thermal equilibrium? a. no net energy is exchanged b. volumes are equal c. masses are equal d. zero velocity 2. The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems? a. zero net forces b. zero velocities c. zero temperature d. thermal equilibrium 3. If it is given that 546 K equals 273C, then it follows that 400 K equals: a. 127C....
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This note was uploaded on 01/06/2012 for the course PHYS 201 taught by Professor Coffin during the Spring '09 term at Oregon State.
- Spring '09