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{\bf Introduction to Astrophysics II, 29:120\\
     Winter, 2006-2007\\
Third Homework Set...February 2, 2007. Due February 8, 2007}\\
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Show calculations and give reasons for your answers. Don't go around 
confused and despondent; if you do not know how to get started, ask me for help. The purpose
of problem sets is to promote thinking and lead to understanding, not 
produce a {\em confiteor} of revealed truth.\\


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{\bf (1)} Problem 11.1 \\

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{\bf (2)}  Problem 11.2\\

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{\bf (3)} Problem 11.3 \\ 


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{\bf (4)}  Problem 11.4\\

{\em For the next couple of problems, you will need to read and understand the material in Section 9.4 of the book, p293, which we did not discuss in class.  Don't worry, it isn't hard.} 

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{\bf (5)} Problem 11.5\\

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{\bf (6)} Problem 11.6\\

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{\bf (7)} Problem 11.8\\

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{\bf (8)} Problem 11.9(a) (don't worry about part (b))\\


 
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