Quiz2-Sol-SSII09

# Quiz2-Sol-SSII09 - Physics 2C Summer Session II Quiz #2...

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Physics 2C Summer Session II Quiz #2 Multiple Choice. Choose the answer that best completes the statement or answers the question. 1 . A given volume of air is originally at T = 20 C with a pressure of P = 10 5 Pa: The air is is compressed to 25% of its original volume while its temperature is increased to 45 C: A) 4 : 34 10 5 Pa B) 2 : 71 10 4 Pa C) 3 : 68 10 5 Pa D) 4 : 00 10 5 Pa E) 2 : 30 10 4 Pa From the ideal gas law PV = nRT: Consider n to be the number of moles of gas that is compressed then nR = P f V f T f = P i V i T i ! P f = V i T f V f T i P i P f = V i T f V f T i P i = 4 273 + 45 273 + 20 10 5 = 4 : 34 10 5 Pa ! A 2 . What is the thermal velocity, v rms ; of 1 : 5 moles helium ( AU = 4 ) atoms contained in a 40 L volume at a pressure P = 3 10 4 Pa ? A) 447 m=s B) 949 m=s C) 548 m=s D) 775 m=s E) 24 ; 500 m=s v rms = p 3 kT=m = p 3 RT=m mol = p 3 PV= ( nm mol ) v rms = p 3 3 10 4 40 10 ± 3 = (1 : 5 : 004) v rms = 774 : 6 m=s ! D 3 . The total kinetic energy of all the molecules in problem

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## This note was uploaded on 04/04/2010 for the course PHYSICS 2C taught by Professor Hicks during the Summer '09 term at UCSD.

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Quiz2-Sol-SSII09 - Physics 2C Summer Session II Quiz #2...

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