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ceomtcl
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Homework Statement
Assuming that we know the density of Earth as a function of radius, we have to derive the equation for gravity as the function of radius.
Homework Equations
The Attempt at a Solution
lets us choose density as [tex]\rho[/tex](r).
I know that within a hollow sphere there is no gravity.
We can assume sum of several hollow spheres with thickness dr, where r is the radius of the shell from center, and then we can integrate it.
I know its an easy question we used to do in undergraduate study, but I am missing something and i can't figure out how it was done? Please help!