Physics 311 Answers to Sample Questions for 3rd Exam
April 2012
pV = NkT for ideal gases, where N is the number of molecules in volume V.
k is Boltzmanns constant (1.38x10-23J/K) and T is the absolute temperature (K).
R=NA k=8.314J/(K-mol), where Avogadro
Reif Problem 5-4 (with additions)
(a) First of all, note that, according to the problem statement, the water
bath is part of the system. From the gure, the top surface of the water is not
insulated, nor is the water volume xed. Because the system is not i
HW Set 4 Problem 5
The gas molecule is taking a 3-d random walk with N steps. Each step has
a vector displacement si that is randomly oriented with a magnitude s governed
by the probability density w(s) = l1 exp(s/l), where l is the mean free path
of the
Mass deposit on rotating drum Problem
The amount of material deposited at location s on the drum is proportional
to the the number of molecules entering through the slit with the right speed.
Thus we write
I (s)ds (v, )|dv |d,
(1)
where (v, )dvd is the ux
Reif Problem 5-5 (with a small modication)
(a) The gas is thermally insulated, and it does positive work on the surroundings (W > 0) by lifting a mass M a certain height. In this case the First
Law says that
E = W,
(1)
and since the gas is ideal we also h
Reif Problem 5-13
The problem is asking you to nd an expression for when the sample is
subjected to small pressure change , made quasi-statically and adiabatically.
A quasi-static, adiabatic process is a process carried out at constant entropy,
i.e., an i
Physics 311 ANSWERS: Sample Problems for Exam #2
March 2012
(1)Short answer questions:
(a) Consider an isolated system that consists of several subsystems interacting thermally and
mechanically with each other. What does the Second Law of Thermodynamics s
Physics 311 Answers for Sample Exam #1
February 2012
(1)(a) A 1-dimensional random walk of N steps has n1 steps to the right and n2 steps to the left,
n1+n2=N, and p is the probability of a right step and q (=1-p) is the probability of a left step. In a
1
Physics 311
Sample Questions for 3rd Exam
April 2012
pV = NkT for ideal gases, where N is the number of molecules in volume V.
k is Boltzmanns constant (1.38x10-23J/K) and T is the absolute temperature (K).
R=NA k=8.314J/(K-mol), where Avogadros number (N
Physics 311
Sample Problems for Exam #2
March 2012
pV = NkT for ideal gases, where N is the number of molecules in volume V.
k is Boltzmanns constant (1.38x10-23J/K) and T is the absolute temperature (K).
R=NA k=8.314J/(K-mol), where Avogadros number (NA)
Physics 311 Sample 1st Exam Problems February 2012
The exam will have 3 questions similar to these. The first question consists of 8 parts, each
requiring a short answer. You have to answer 6 out of 8. (Your best 6 scores count, so you can
try all 8.) The
Physics 311: Thermal Physics
Instructor:
Gerald Wilemski
Office:
209 Physics
M-W-F 3:00-3:50 Rm 127
(email: wilemski@mst.edu)
Phone: 341-4409
Spring 2012
Office Hours: T 5-6 pm, Th 6-8 pm PLC-see below (Check to see if Im around at other times).
Text:
Rei
Physics 311
3rd Exam
19 April 2012
Name_ANSWERS_
Answer all questions. Show your work and briefly explain your answers.
pV = NkT for ideal gases, where N is the number of molecules in volume V.
k is Boltzmanns constant (1.38x10-23J/K) and T is the absolut
Physics 311
2nd Exam
22 March 2012
Name_
Answer all questions. Show your work and briefly explain your answers.
pV = NkT for ideal gases, where N is the number of molecules in volume V.
k is Boltzmanns constant (1.38x10-23J/K) and T is the absolute temper
Physics 311 Exam #1 Answers 16 February 2012
Name_
Answer all questions except as noted. Please try to confine your answers to the space provided.
Show your work and briefly explain your answers.
WN (n1 )
M0 = n v /4
N ! n1 n2
pq
n1 ! n2 !
v 2 3kT / m
K=
Reif Problem 5-13
Start with the fundamental denition of Cp in terms of S ,
S
.
Cp = T
T p
Then take the desired pressure derivative to get
!
Cp
S
=T
.
p T
p T p
(1)
(2)
T
Now invert the order of dierentiation on the right-hand-side to get
Cp
S
=T
.
p