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H133_quiz7_key

# H133_quiz7_key - Name Physics H133(Spring 2011 Quiz#7 Full...

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Unformatted text preview: Name: Physics H133 (Spring, 2011): Quiz #7 Full credit 2 10 points Possibly useful relations: __ 3 3k T P pV : NkBT Km 2 E1c,ng vrms : 5 U 2120—le311 T = (273.16 K) PW) AU : Q+W (1W 2 —PdV PW = const. dU = mch NA = 6x1023 k3 = 1.38x10"23 J/K 1. (2 pts.) If the average speed of molecules in a container triples while the volume and number of molecules stay the same, the average pressure on the container walls will A. remain the same 1 3‘ ,ﬁ B. decrease by a factor 3 (“Vim : #‘ i (r , x. 74' \I i‘ v‘ \ x \ i V r \ C. triple C % \ Q» lions lr KQLLD ’ Q33 increase by a factor 9 \ ‘05 O\ VﬁN'JTQC x E. Impossible to say . w a 9: W N m imam-git Explain! / A ,, ’U \/ [S Qmeeori Freeway N: 0 0L 0” a 2. (3 pts.) Two identical rooms, A and B, are sealed except for an open doorway between them. Room A is warmer than B. Assume the door has been open long enough that the pressure has equalized between the rooms (this typically happens very quickly) but not the temperature. Which room has the greater number of molecules? A. Room A i = « mm. Q .3 n/ a I ' B RoomB P‘s-'M‘Q’EM 3; l A C. Both have the same number y: Nﬁgg ‘ 9 p C NEKQB Explain! ‘ ‘* \1 f I J t\ f: Vassar: are“ Bag ‘85- WORM my \ 35 Vﬁr JFK): V 3. (2 pts.) Imagine we add 12.5 J of energy to 1 mole of a certain type of gas, and its temperature increases by 1K. If this experiment occurred at room temperature, what can we likely say about the gas molecules? monatornic ADV? \ 5 \ B. diatomic U v v C. polyatomic N D. Not enough information is provided 99 w * (.5 Show your work! N Au \ _\ k \ 5w : sad (“ 235i 3 ' l? \ 2.» A, : I c J New .5 2 EV r“ ~>~ Own“ y \xﬁj‘rgy ()1 [/7 V1 4. (3 pts.) Consider the P i V diagram shown below with a gas process starting at A and going to B. It is moving along a line of constant temperature. Describe the behaviour of each of AU, Q, and W while going from A to B as = O, > O or < O and state whether heat and work are ﬂowing in or out of the system, Justify your answers. ...
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H133_quiz7_key - Name Physics H133(Spring 2011 Quiz#7 Full...

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