Physics 4311: Thermal Physics
10 March 2016
Winter-Spring 2016
READING SCHEDULE: 14 March - 24 March
Mon. 14 Mar.: Test #2 Review Class, 2 pm, Rm 202
Tues.. 15 Mar.: Test #2 covers Ch. 2, 3, 4 [L8 - L14], HW #5(Prob. 3-5) - 8
Thurs. 17 Mar.: St. Pats - No class
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Tues. 22 Mar.: L16 - 5.5, 5.6, 5.7, 5.8
Optional reading in Van Ness: Chapters 3, 4, and especially 5 and 6, should be helpful.
Thurs. 24 Mar.: L17 -Sec. 5.8, 5.9, 5.10
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Problem Set #9 Due on Thursday 24 March
#1 Reif: 5.1 [You may use results from Reif 4.3 for part (b) of 5.1.]
(c) Let ( = 5/3. Find Tf if V i /Vf = 8.
#2 Reif: 5.2 [Hint: Avoid doing the integrals by using geometric relations for areas.]
(d) What is the entropy change of the gas in going from state A to state C?
#3 Reif: 5.3 [Hint: Avoid doing the integrals by using geometric relations for areas.]
(e) What is the entropy change of the surroundings for this process?
#4 Reif: 5.4 + extra part (d) What are the final pressures of He and Ar and what is the entropy
change of the surroundings for this process?
#5 Reif: 5.5 In part (c) find Tf in terms of cV, R, p, p0 and T0.
#6 Reif: 5.13 (Note there is a sign error in Reif’s answer.)
#Bonus (3pts.) Reif: 5.7 In part (a) it may help to do a force balance on a thin layer of air of
thickness dz and area A in mechanical equilibrium at height z. [In (c) give a numerical result; in
(d) and (e) evaluate p/p0 at an altitude of 1.6 km. You should find that the answers are nearly the
same.]
Please be sure to answer the extra parts of Problems 1, 2, 3, 4, 5.