Phys213Sample Final 2 - P213 FINAL FALL 2004 Form A 1. One...

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P213 FINAL FALL 2004 Form A 1. One mole of an ideal gas expands slowly and isothermally at temperature T until its volume is doubled. The change of entropy per molecule of this gas for this process is: A. ln(2) / T B. 2 k C. zero D. k ln(2) E. k T ln(2) 2. The heat capacity of object B is twice that of object A. Initially A is at 300K and B is at 450K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is: A. 400 K 300 K C. 600 K D. 200 K 450 K 3. A 10 g ice cube at -10°C is placed in a lake whose temperature is 15°C. Calculate the change in entropy of the ice cube as it becomes water and reaches the lake temperature. A. 15.2 J/K 3.8 J/K C. 3.1 J/K D. 2.0 J/K 0.8 J/K Page 1
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P213 FINAL FALL 2004 Form A 4. The P-V diagram shows when one mole of He is taken through a reversible cycle. Process ab is constant volume, bc is isothermal and ca is constant pressure. Use R = 8.314 J/mol.K in the calculations. Calculate the work done by the gas during the isothermal process bc . P 0 = 831.4 N/m 2 V 0 = 1m 3 Isothermal Pressure Volume a b 8p 0 P 0 8V 0 V 0 c A. -8730 J B. 0 J C. -5814 J D. +13831 J E. +5820J 5. A Carnot heat engine uses 1 mole of an ideal monatomic gas and operates between two reservoirs at T = 600 K and T = 300 K. Calculate the work done by the gas during the adiabatic compression part of the Carnot cycle. A. -3741 J +5602 J C. -5602 J D. +3741 J No work is done since the process is adiabatic. 6. An ideal monatomic gas expands isothermally to ten times its initial volume. Which of the following statements is correct in this situation? A. The work done by the gas equals the heat absorbed by the gas. There is no work done by the gas or on the gas. C. There is no exchange of heat between the gas and its surroundings. D. The internal energy of the gas increases tenfold. The change in internal energy of the gas equals the heat absorbed by the gas. Page 2
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P213 FINAL FALL 2004 Form A 7. A horizontal pipe 8 cm in diameter has a smooth reduction to a pipe of 6 cm in diameter. If the pressure of the water in the larger pipe is 8 x 10 4 Pa and the pressure in the smaller pipe is 6 x 10 4 Pa, at what rate does the water flow through the pipes?
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This note was uploaded on 03/02/2008 for the course PHYS 213 taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.

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Phys213Sample Final 2 - P213 FINAL FALL 2004 Form A 1. One...

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