hmwk-6-Fall-2006

# hmwk-6-Fall-2006 - PHY 317K HOMEWORK 6 DUE on December 6...

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PHY 317K November 28, 2006 HOMEWORK # 6 DUE on December 6, 2006 by 8:00pm Instructions: Use a SCANTRON ANSWER SHEET to mark answers. Provide your NAME (last, first), UT EID, and UNIQUE NUMBER of the course. Sign and date it. The answer sheets must be placed in the 317K box (by bulletin board outside PAI 2.48) by 8:00pm on Wednesday, December 6, 2006. Late homework will not be graded. Answer the following 55 questions: 1. If two objects are in thermal equilibrium with each other A) they cannot be moving B) they cannot be undergoing an elastic collision C) they cannot have different pressures D) they cannot be at different temperatures E) they cannot be falling in the Earth's gravitational field 2. In constructing a thermometer it is NECESSARY to use a substance that: A) expands with rising temperature B) expands linearly with rising temperature C) will not freeze D) will not boil E) undergoes some change when heated or cooled 3. When a certain constant volume gas thermometer is in thermal contact with water at its triple point (273.16 K) the pressure is 6.30 × 10 4 Pa. For this thermometer 1 K corresponds to a change in pressure of about: A) 4.34 × 10 2 Pa B) 2.31 × 10 2 Pa C) 1.72 × 10 3 Pa D) 2.31 × 10 3 Pa E) 1.72 × 10 7 Pa 4. When the temperature of a copper penny is increased by 100 C ° , its diameter increases by 0.17%. The area of one of its faces increases by: A) 0.17% B) 0.34% C) 0.51% D) 0.13% E) 0.27% Page 1

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5. The coefficient of linear expansion of iron is 10 –5 per C ° . The volume of an iron cube, 5 cm on edge, will increase by what amount if it is heated from 10 ° C to 60 ° C? A) 0.00375 cm 3 B) 0.1875 cm 3 C) 0.0225 cm 3 D) 0.00125 cm 3 E) 0.0625 cm 3 6. Heat is: A) energy transferred due to a temperature difference B) energy transferred by macroscopic work C) energy content of an object D) a temperature difference E) a property objects have by virtue of their temperatures 7. Heat has the same units as: A) temperature B) work C) energy/time D) heat capacity E) energy/volume 8. The heat capacity of an object is equal to: A) the amount of heat energy to raise its temperature by 1 ° C B) the amount of heat energy to change its state without changing its temperature C) the amount of heat energy per kilogram to raise its temperature by 1 ° C D) the ratio of its specific heat to that of water E) the change in its temperature caused by adding 1 J of heat 9. The specific heat of a substance is equal to: A) the amount of heat energy to change the state of one gram of the substance B) the amount of heat energy per unit mass emitted by oxidizing the substance C) the amount of heat energy per unit mass to raise the substance from its freezing to its boiling point D) the amount of heat energy per unit mass to raise the temperature of the substance by 1 ° C E) the temperature of the object divided by its mass Page 2
10. The heat capacity at constant volume and the heat capacity at constant pressure have different values because: A) heat increases the internal energy at constant volume but not at constant pressure B) heat increases the internal energy at constant pressure but not at constant volume

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hmwk-6-Fall-2006 - PHY 317K HOMEWORK 6 DUE on December 6...

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