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motion: TOC for Knowledge Concepts, Exercises, and Solutions

Johannes Kepler arrived at his laws of orbital motion empirically - that is, he 
matched the data he had obtained with mathematical principles.  But, he did not 
know why those principles worked.  But we do!  

Show mathematically how Kepler's Second Law - that of equal times in equal areas - 
is a direct consequence of the conservation of angular momentum.