# Ch10 - Chapter 10 Thermal Physics CHAPTER 10 1 If it is...

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Chapter 10, Thermal Physics C HAPTER 10 1. If it is given that 546 K equals 273 ° C, then it follows that 400 K equals: a. 127 ° C b. 150 ° C c. 473 ° C d. 1 200 ° C 2. A steel wire, 150 m long at 10 ° C, has a coefficient of linear expansion of 11 × 10 6 /C ° . Give its change in length as the temperature changes from 10 ° C to 45 ° C. a. 0.65 cm b. 1.8 cm c. 5.8 cm d. 12 cm 3. A rectangular steel plate with dimensions of 30 cm × 25 cm is heated from 20 ° C to 220 ° C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10 6 /C ° .) a. 0.82 cm 2 b. 1.65 cm 2 c. 3.3 cm 2 d. 6.6 cm 2 4. What happens to a given mass of water as it is cooled from 4 ° C to zero? a. expands b. contracts c. vaporizes d. neither expands, contracts, nor vaporizes 5. An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature triples? a. 1/9 b. 1/3 c. 3.0 d. 9.0 119

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Chapter 10, Thermal Physics 6. An ideal gas is confined to a container with constant volume. The number of moles is constant. By what factor will the pressure change if the absolute temperature triples? a. 1/9 b. 1/3 c. 3.0 d. 9.0 7. An ideal gas is confined to a container with adjustable volume. The number of moles and temperature are constant. By what factor will the volume change if pressure triples? a. 1/9 b. 1/3 c. 3.0 d. 9.0 8. A 2.00-L container holds half a mole of an ideal gas at a pressure of 12.5 atm. What is the gas temperature? ( R = 0.082 1 L atm/mol K) A. 1 980 K b. 1 190 K c. 965 K d. 609 K 9. Two ideal gases, X and Y, are thoroughly mixed and at thermal equilibrium in a single container. The molecular mass of X is 9 times that of Y. What is the ratio of root-mean- square velocities of the two gases, v X, rms / v Y, rms ? a. 9/1 b. 3/1 c. 1/3 d. 1/9 10. The observation that materials expand in size with an increase in temperature can be applied to what approximate proportion of existing substances? a. 100% b. most c. few d. none 11. 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 120
Chapter 10, Thermal Physics 12. What is the temperature of a system in thermal equilibrium with another system made up of water and steam at one atmosphere of pressure? a. 0 ° F b. 273 K c. 0 K d. 100 ° C 13. What is the temperature of a system in thermal equilibrium with another system made up of ice and water at one atmosphere of pressure? a. 0 ° F b. 273 K c. 0 K d. 100 ° C 14. Which best describes a system made up of ice, water and steam existing together?

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Ch10 - Chapter 10 Thermal Physics CHAPTER 10 1 If it is...

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