What is the relation between a shell and a solid sphere?

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athrun200
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Homework Statement




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Homework Equations





The Attempt at a Solution



What is the relation between a shell and a solid sphere?
Can you give me some hints?
 

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A solid sphere can be thought of as composed of an arbitrarily large number of smaller shells...
How could you 'add up' the effects of many smaller shells, to construct a sphere?