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{\bf Introduction to Astrophysics I, 29:119\\
     Fall, 2006\\
First Homework Set...August 29, 2006. Due September 12, 2006}\\
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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)}  Using equations developed in class, demonstrate that the gravitational force of a circularly symmetric distribution of mass in a disk on a point mass in the plane of the disk, but beyond its edge is {\em not} the same as if all the mass were concentrated in a point mass at the center of the disk (i.e. the result differs from that of a sphere).  You can use either a program such as Mathematica or MathCad (recommended) or analytic methods. \\

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{\bf (2)}  Problem 2.1\\

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{\bf (3)} Problem 2.2 \\ 


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{\bf (4)}  Problem 2.3\\

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{\bf (5)} Problem 2.4\\

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{\bf (6)} Problem 2.6  \\

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{\bf (7)} Problem 2.7  \\


 
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