Oregon State University
Physics 202
,
Winter 2010
HW810 (due March 12 at 5:00 p.m.)
Page
1
Oregon State University
Physics 202
Winter Term,
2010
HW810
This HW assignment, due March 13, covers topics from Chapters
o
11 and 12 of the text—and some may also use
concepts and relations from other chapters
r
covered this term.
Of these ten problems,
three will be scored (for a
possible 30 points).
Donʼt forget the extra credit point that is available, too—see the course web site, under the
links for recitation/Homework (HW).
/
Follow the recommended format for problem solutions, use SI units unless
directed otherwise, and assume three significant digits in all numerical answers.
Note that you may need to refer
r
to a periodic table—thereʼs one in your textbook.
1.
Helium (He), a monatomic gas, fills a 0.031m
3
container.
The pressure of the gas is 5.6 x 10
5
Pa.
How long
would a 0.333hp engine have to run (1 hp = 746 W) to produce an amount of energy equal to the internal
energy of this gas?
2.
The pressure of a certain tank of sulfur dioxide (SO
2
) is 3.21 x 10
4
Pa.
There are 214 moles of this gas in a
volume of 40.0 m
3
.
Find the translational rms speed of these gas molecules.
Note:
Although this gas is not
monatomic (and would thus have some significant kinetic energy due to
rotation of its molecules) , we can still
approximate its translational kinetic energy (and therefore its
l
translational rms speed) using the monatomic
l
ideal gas model.
3.
A heat engine produces a total of 425 J of work by using an ideal gas in these three processes:
Beginning at a
pressure of 1.32 x 10
5
Pa and a volume of 2.20 x 10
3
m
3
, the pressure is increased isochorically to 5.70 x 10
5
Pa.
Next, the gas expands adiabatically back to its original pressure.
Finally, its volume is reduced isobari
cally back to its original volume.
Calculate the efficiency of this engine.
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 Spring '08
 Staff
 Physics, Thermodynamics, Energy

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