Quiz8A - Physics 2C Spring 2009 Quiz 8A

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Unformatted text preview: Physics 2C Spring 2009 Quiz 8A Name___________________________________ Constants R= 8.31 J/K MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The temperature of an ideal gas in a sealed 0.40m 3 container is reduced from 350 K to 270 K. The final pressure of the gas is 60 kPA. The molar heat capacity at constant volume of the gas is 28.0 J/mol K. The heat absorbed by the gas, in kJ, is closest to: A) 24 B) 24 C) 31 D) 31 E) zero 2) An ideal gas in a balloon is kept in thermal equilibrium with its constanttemperature surroundings. How much work is done by the gas if the pressure is slowly reduced and the balloon expands to 6.0 times its original size? The balloon initially has a pressure of 645.0 Pa and has a volume of 0.10 m 3 . A) 330 J B) 120 J C) 6.0 J D) 390 J E) 240 J 3) 1) 2) 3) The figure shows 1.8 g of helium gas (4.0 g/mol) that undergoes the process 1 2 3. Find the value of V . 3 A) 17 liters B) 34 liters C) 8.6 liters D) 69 liters E) 25 liters 4) 4) 20.0 L of a monatomic ideal gas at a pressure of 100 kPa expand adiabatically until the volume doubles. What is the pressure in the gas at that point? A) 317 kPa B) 50.0 kPa C) 400 kPa D) 31.5 kPa E) 200 kPa 5) The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20.0C as the hot temperature reservoir, and the water at some depth, with a temperature of 5.0C, as the cold temperature reservoir for a heat engine. What is the maximum efficiency of an engine running between those two temperatures? A) 7.9% B) 4.3% C) 7.2% D) 5.1% E) 15% 6) A Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 34 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 229 K. The power requirement for the heat pump under these operating conditions, in SI units, is closest to: A) 13,000 B) 7500 C) 9600 D) 6000 E) 17,000 5) 6) 1 Answer Key Testname: QUIZ 8 1) A 2) B 3) A 4) D 5) D 6) B 2 ...
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This note was uploaded on 09/23/2009 for the course PHYS 2c taught by Professor Wurthmeir during the Spring '05 term at UCSD.

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