4) Calculate the internal energy U of a liter of helium at room temperature and atmospheric pressure. Then repeat the calculation for a liter of air.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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Answer question four please.
4) Calculate the internal energy U of a liter of helium at room temperature and atmospheric pressure.
Then repeat the calculation for a liter of air.
5) The equipartition theorem allows us to write U = aNKT, where the constant a is the number of
(active) degrees of freedom per molecule and k is Boltzmann's constant. Write an expression for
the change in internal energy AU.
6) What does the expression for AU from the previous problem say about AU if the temperature is
constant?
7) Consider the p-V plot shown to the right.
The work done by the system during a process is
Sinal
Wby = Jyrte,p dv.
P
%3D
How much work is done along path i?
b. Cross-hatch the area on the plot that
represents the amount of work done along
a.
ii
path ii.
iV
Vz
V, v
a
22°F
Eh
hp
Transcribed Image Text:4) Calculate the internal energy U of a liter of helium at room temperature and atmospheric pressure. Then repeat the calculation for a liter of air. 5) The equipartition theorem allows us to write U = aNKT, where the constant a is the number of (active) degrees of freedom per molecule and k is Boltzmann's constant. Write an expression for the change in internal energy AU. 6) What does the expression for AU from the previous problem say about AU if the temperature is constant? 7) Consider the p-V plot shown to the right. The work done by the system during a process is Sinal Wby = Jyrte,p dv. P %3D How much work is done along path i? b. Cross-hatch the area on the plot that represents the amount of work done along a. ii path ii. iV Vz V, v a 22°F Eh hp
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