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Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
Web
Assign
Current Score:
16 out of 16
Due:
Wednesday, December 3, 2008 09:00 AM EST
Description
Entropy; Temperature
Instructions
Reading: Sections 11.411.5
The due date for this assignment is past.
Your work can be viewed below, but no changes
can be made.
1. [MI2e 11.X.3a]
3/3 points
Object
A
and object
B
are two identical microscopic objects. The table below shows the
number of ways to arrange energy in one of these objects, as a function of the amount of
energy in the object.
E
(joules)
4.e21 6.e21 8.e21 1.e20 1.2e20 1.4e20 1.6e20
# ways
6
20
37
60
90
122
148
When there are
1.2e20
joules of energy in object
A
, what is the entropy of this
object?
S
A
=
6.21E23
6.21e23
J/K
When there are
1.6e20
joules of energy in object
B
, what is the entropy of this
object?
S
B
=
6.90E23
6.90e23
J/K
Now the two objects are placed in contact with each other. At this moment, before
there is time for any energy flow between the objects, what is the entropy of the
combined system of objects
A
and
B
?
S
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 Spring '09
 Kindermann
 Current, Work, Entropy

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