Chapter 14
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Chapter 14

Course Number: PHY 2130, Winter 2011

College/University: Wayne State University

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Chapter 14 Heat 3. If the temperature of 2.000 moles of an ideal gas is increased by 50C, then what is the increase in the total internal energy? A. 1,247 J B. 1,980 J C. 2,250 J D. 2,750 J E. 3,030 J 5. Which of the following is not included in the internal energy of a system? A. The kinetic energy of the center of mass B. The kinetic energy of the individual particles C. The spring potential energy of the...

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14 Chapter Heat 3. If the temperature of 2.000 moles of an ideal gas is increased by 50C, then what is the increase in the total internal energy? A. 1,247 J B. 1,980 J C. 2,250 J D. 2,750 J E. 3,030 J 5. Which of the following is not included in the internal energy of a system? A. The kinetic energy of the center of mass B. The kinetic energy of the individual particles C. The spring potential energy of the individual particles D. The chemical energy of the individual particles E. The nuclear energy of the individual particles 10. 200 Joules of heat flows into a 35 g sample. If the temperature increases by 10C, then what is the heat capacity of the sample, in J/ C? A. 8.0 B. 12 C. 16 D. 20 E. 32 15. A 100 g glass container contains 250 g of water all at 15.0C. A 100 g piece of unknown material at 100C is added to the water in the container. The final temperature of the mixture is 19.0C. What is the specific heat of the unknown material in J/kgC (specific heat of water = 4186J/kgC, specific heat of glass = 837.2J/kgC)? A. 245 B. 387 C. 412 D. 558 E. 674 1 18. The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R. What is the heat needed to heat 28.00 g of air from 20.00C to 85.00C? A. 1,350 J B. 2,890 J C. 1,753 J D. 1,540 J E. 1,443 J 20. A sample of helium has a volume of 2.00 liters, a temperature of 20.0C, and a pressure of 2.50 atmospheres. What is the energy needed to heat at constant volume the sample of helium gas from 20.0C to 95.0C? A. 88.0 J B. 137 J C. 175 J D. 207 J E. 476 J 22. The heat of fusion for lead at 327.0C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kgC. What is the energy needed to melt 100 grams of lead starting at 0C? A. 3.56 kJ B. 4.23 kJ C. 6.54 kJ D. 7.02 kJ E. 7.76 kJ 25. The heat of fusion for ice at 0C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kgC, and the heat of vaporization of water at 100C is 2,256 kJ/kg. What is the energy needed to vaporize 100 grams of ice at starting at 0C? A. 600 kJ B. 500 400 kJ C. kJ D. 300 kJ E. 200 kJ 2 27. The specific of ice is 2.10 kJ/kgC, the heat of fusion for ice at 0C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kgC, and the heat of vaporization of water at 100C is 2,256 kJ/kg. What is the final equilibrium temperature when 10.0 grams of ice at -15C is mixed with 40.0 grams of water at 75C? A. 59.5C B. 57.2C C. 53.6C D. 48.9C E. 42.6C 28. The specific of ice is 2.10 kJ/kgC, the heat of fusion for ice at 0C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kgC, and the heat of vaporization of water at 100C is 2,256 kJ/kg. What is the final equilibrium temperature when 5.00 grams of ice at -15.0C is mixed with 40.0 grams of water at 75.0C? A. 30.1C B. 28.3C C. 20.9C D. 18.6C E. 16.1C 33. The specific heat of ice is 2.10 kJ/kgC, the heat of fusion for ice at 0C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kgC, the heat of vaporization of water at 100C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kgC. What is the final equilibrium temperature when 40.0 grams of ice at 0C is mixed with 5.00 grams of steam at 120C? A. 3.01C B. 2.65C C. 1.21C D. 1.07C E. 0.90C 52. A brass rod is placed between two temperature sources so that heat can flow between them. One temperature is 80C and the other temperature is 20C. The length of the rod is 50.0 cm and the cross sectional area is 15.0 cm2. If the coefficient of thermal conduction for brass is 100 W/m C, then what is the heat flow between the hot temperature and the cold temperature? A. 7.5 W B. 8.2 W C. 9.4 W D. 12 W E. 18 W 3 53. A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0C and the other temperature is 25.0C. The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2. If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal? A. 69.2 W/mK B. 58.2 W/mK C. 50.4 W/mK D. 46.3 W/mK E. 44.2 W/mK 4 1

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