Oregon State University
Physics 202 Final Exam
Winter Term,
r
2010
(Form A)
General directions
:
Only one sheet of paper (8.5” x 11”—both sides), with only
handwritten notes, may be used during this exam.
You may use
any kind of calculator, provided that it is not part of a PDA, cell phone, palmtop or laptop—and that it is not transmitting any information wirelessly.
Physical constants and other possibly useful information are provided here.
Physical constants and other possibly useful information:
P
atm
= 1.01 x 10
5
Pa
g
= 9.80 m/s
2
L
f.w
ater
=
3.33 x 10
5
J/kg
c
water
=
4190 J/(kg·K)
c
ice
=
2090 J/(kg·K)
k
wood
=
0.2 W/(m·K)
T
K
=
T
C
+ 273
N
A
= 6.02 x 10
23
k
= 1.38 x 10
23
J/K
R
= 8.31 J/(mol·K)
σ
= 5.67 x 10
8
J/(s·m
2
·K
4
)
V
cube
=
s
3
SA
cube
=
6
s
2
Question #1:
Your form letter will be given to you shortly before you turn in your exam.
(If itʼs not written on the board by the time you finish
your exam, bring your form with your answer booklet to the proctor.)
Enter it
in the large box at the top of the first answer page
t
.
For questions 2
16
:
For multiplechoice or true/false items, write the letter of the
one best answer in the appropriate box on the answer sheet.
For
t
questions requiring
short
answers (a word or
t
short phrase only), write those in the spaces provided.
Youʼre graded on your answers only—no need
to show work.
Assume 3 significant digits and SI units in all numeric answers unless instructed otherwise.
True/False
(10 points each)
2.
True or false?
v
rms
is the average speed of a particle
of
monatomic ideal gas.
F
3.
True or false?
Isobarically raising the thermal energy
of 1 kg of helium by 100,000 J requires a greater heat
input than achieving the same result
isochorically.
T
4.
True or false?
CP
refrigerator
can be less than 1.
T
5.
True or false?
A monatomic ideal gas
must rise in
temperature
if its pressure increases.
F
6.
True or false?
Entropy is conserved in
any isolated
system.
F
7.
True or false?
A Carnot heat
A
engine cannot convert all its
input heat to work.
T
Short Answer
(10 points each)
8.
How much work is required to isothermally double the
density of 10 moles of a monatomic ideal gas at 20°C?
1.69 x 10
4
J
9.
A monatomic ideal gas expands isobarically.
What is
the
ratio
Q
/
Δ
E
th
in this process?
1.67
(
or
5/3
)
10.
Express the work rate of a heat engine in fundamental
(base) SI units.
Reduce your answer to simplest terms.
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 Spring '08
 Staff
 Physics, Thermodynamics, Energy, Entropy, Monatomic Ideal Gas

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