Fall 2010
RED
barcode here
Physics 123 section 2
Exam 2
Colton 23669
Please write your CID here __________
No time limit.
One 3
×
5 note card (handwritten, both sides). No books. Student calculators OK.
Constants
which you may or may not need:
g
= 9.8 m/s
2
G
= 6.67
×
10
11
N
⋅
m
2
/kg
2
k
B
= 1.381
×
10
23
J/K
N
A
= 6.022
×
10
23
R
=
k
B
∙
N
A
=
8.314 J/mol∙K
σ
= 5.67
×
10
8
W/m
2
∙K
4
I
0
= 10
12
W/m
2
Density of water: 1000 kg/m
3
Density of air: 1.29 kg/m
3
Density of aluminum: 2700 kg/m
3
Linear exp. coeff. of aluminum: 24
×
10
6
/
°
C
Linear exp. coeff. of copper: 17
×
10
6
/
°
C
Linear exp. coeff. of steel: 11
×
10
6
/
°
C
Specific heat of water: 4186 J/kg
⋅°
C
Specific heat of ice: 2090 J/kg
⋅°
C
Specific heat of steam: 2010 J/kg
⋅°
C
Specific heat of aluminum: 900 J/kg
⋅°
C
Specific heat of copper: 387 J/kg
⋅
ºC
Latent heat of melting (water): 3.33
×
10
5
J/kg
Latent heat of boiling (water): 2.26
×
10
6
J/kg
Latent heat of boiling (liquid nitrogen):
1.98
×
10
5
J/kg
Thermal conduct. of alum.: 238 J/s
⋅
m
⋅°
C
Thermal conduct. of copper: 397
J/s
⋅
m
⋅°
C
Speed of sound in air: 343 m/s (unless
otherwise specifed)
Conversion factors which may or may not be helpful:
1 inch = 2.54 cm
1 m
3
= 1000 L
1 atm = 1.013
×
10
5
Pa = 14.7 psi
1 eV = 1.602
×
10
19
J
32
5
9
+
=
C
F
T
T
273.15
K
C
T
T
=
+
Other equations which you may or may not need to know:
2
4
2
b
b
ac
x
a
 ±

=
Surface area of sphere
=
2
4
r
π
Volume of sphere =
(
29
3
4 3
r
Instructions:
•
Record your answers to the multiple choice questions (“Problem 1” on the next page) on the bubble sheet.
•
To receive full credit on the worked problems, please show all work
and write neatly
.
•
In general, to maximize your partial credit on worked problems you get wrong it’s good to solve problems algebraically
first, then plug in numbers (with units) to get the final answer. Draw pictures and/or diagrams to help you visualize what
the problems is stating and asking, and so that your understanding of the problem will be clear to the grader.
•
Unless otherwise instructed, give all numerical answers for the worked problems in SI units, to 3 or 4 significant digits.
For answers that rely on intermediate results, remember to keep extra digits in the intermediate results, otherwise your
final answer may be off. Be especially careful when subtracting two similar numbers.
•
Unless otherwise specified, treat all systems as being frictionless (e.g. fluids have no viscosity).
Scores: (for grader to fill in)
Problem 1
__________
Problem 2
__________
Problem 3
__________
Problem 4
__________
Problem 5
__________
Problem 6
__________
Problem 7
__________
Problem 8
__________
Problem 9
__________
Extra Credit __________
Total
_____________
Thermo Exam 2 – pg 1
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Problem 1
: Multiple choice conceptual questions. Choose the best answer.
Fill in your answers on the bubble sheet.
1.1.
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 Physics, Frequency, Wavelength, Thermo Exam, j. 2π/6

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