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Oct15-11, 06:48 AM
P: 17,227
I am not quite sure what your setup and desired computations. First, is your sphere an approximately rigid object and you want to know about stresses on it due to gravity or is your sphere a collecition of non interacting particles and you want to see how they move relative to each other? Also, is it free falling or is it at rest wrt the shell or undergoing some other motion? Do you want a set of coordinates which smoothly transitions from interior to exterior?