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e 115
Engineering Thermodynamics
Fall 2009
University of California
Problem set 2
Due:
Friday, September 4
th
, in lecture
1)
(35 points)
One mole of a monatomic ideal gas, initially at 300K and a pressure of 2 atmospheres is subjected to
a series of reversible processes (
P
ext
=
P
gas
+
d
P
) that ultimately return the system to its original state.
a)
The first series of processes entails: 1) an isobaric tripling of the volume, 2) an isochoric tripling
of the pressure, and 3) a return to the original state along a path prescribed by an equation of
the form
P
=
aV
2
+
b
where pressure is in atmospheres and volume in liters. Make a sketch of
the process. Determine the coefficients
a
and
b
, and then, the heat and work interactions and
the internal energy and enthalpy change of the system associated with each step.
b)
In a variation of process 1 described in part a), the pressure
varies
as the volume is tripled.
Letting
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This note was uploaded on 02/12/2011 for the course E 115 taught by Professor Staff during the Fall '08 term at University of California, Berkeley.
 Fall '08
 Staff
 Dynamics

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