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Quiz5_solutions - Physics 2 Summer Session 2008 Quiz 5...

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Physics 2 – Summer Session 2008 Quiz # 5 Question 1 Consider four objects A, B, C, and D. It is found that A and B are in thermal equilibrium. It is also found that C and D are in thermal equilibrium. However, A and C are not in thermal equilibrium. One can conclude that (a) B and D are in thermal equilibrium (b) B and D are not in thermal equilibrium (c) B and D could be in thermal equilibrium, but might not be (d) The zeroth law of thermodynamics does not apply here because there are more than three objects Thermal equilibrium: they have the same temperature. When expressed in these terms, it is clear that the correct answer is (b). Question 2 Six molecules have the speeds (in arbitrary units) of 2, 2, 4, 8, 4, 10. What is the rms speed (to the nearest integer) of the molecules (V 2 ) AV = 1/6 ( 2 2 + 2 2 +4 2 +8 2 +4 2 +10 2 ) = 34. Take the sqrt of this, obtain 5.8 Æ Correct answer is (e)
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