sm_pdf_chapter10 - Chapter 10 Thermal Physics Quick Quizzes...

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Chapter 10 Thermal Physics Quick Quizzes 1. (c). When two objects having different temperatures are in thermal contact, energy is transferred from the higher temperature object to the lower temperature object. As a result, the temperature of the hotter object decreases and that of the cooler object increases until thermal equilibrium is reached at some intermediate temperature. 2. (b). The glass surrounding the mercury expands before the mercury does, causing the level of the mercury to drop slightly. The mercury rises after it begins to get warmer and approach the temperature of the hot water, because its coefficient of expansion is greater than that for glass. 3. (c). Gasoline has the highest coefficient of expansion so it undergoes the greatest change in volume per degree change in temperature. 4. (c). A cavity in a material expands in exactly the same way as if the cavity were filled with material. Thus, both spheres will expand by the same amount. 5. (a). It expands. Imagine the balloon rising into air at uniform temperature. The air cannot be uniform in pressure because the lower layers support the weight of all the air above them. The rubber in a typical balloon stretches or contracts until interior and exterior pressures are nearly equal. So as the balloon rises, it expands; this can be considered as constant temperature expansion with V increasing as P decreases by the same factor in . If the rubber wall is strong enough, the buoyant force will eventually match the total weight of the balloon and helium so the balloon will stop rising. It is more likely that the rubber will stretch and rupture, releasing the helium, which in turn will escape from Earth’s atmosphere. PV nRT = 6. (b). Since the two containers are at the same temperature, the average kinetic energy per molecule is the same for the argon and helium gases. However, helium has a lower molar mass than does argon, so the rms speed of the helium atoms must be higher than that of the argon atoms. 373
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374 CHAPTER 10 Answers to Even Numbered Conceptual Questions 2. As the moment of inertia of the balance wheel increases, the angular acceleration the spring can give the wheel will decrease. Thus, the wheel will not oscillate as rapidly as it should, causing the watch to run slow. 4. This is very good advice. As the engine heats, pressure builds up in the radiator causing most of the water in the system to remain liquid even at temperatures above the normal boiling point of water. Opening the radiator cap while the engine is still hot would result in an explosive release of this pressure and very rapid boiling of the water. This will cause steam and superheated water to spew from the radiator, and can result in serious burns to the person opening the cap. 6. The temperature of the bearing can be increased until its diameter becomes large enough to slip over the axle.
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This note was uploaded on 04/08/2008 for the course PHY 101 taught by Professor Pralle during the Spring '08 term at SUNY Buffalo.

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sm_pdf_chapter10 - Chapter 10 Thermal Physics Quick Quizzes...

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