Re: shell theorem

On Nov 11, 1:48 am, eric gisse <jowr.pi.nos...@xxxxxxxxx> wrote:
On Mon, 10 Nov 2008 15:30:03 -0800 (PST), winston71

<donke...@xxxxxxxxxxxxx> wrote:
Hello,
From wikipedia "1. A spherically symmetric body affects external
objects gravitationally as though all of its mass were concentrated at
a point at its center."

I don't understand the integration. I tried to make a computer
simulation (million random points represent a sphere, there is a test
point outside the sphere, calculate and add each gravity force
vector), but the results came out wrong; total force is minimum when
sphere radius touches test point, and gets stronger as sphere radius
gets smaller (number of sphere points is constant and test point
coordinates is constant). Did anyone try such a simulation and got
good results? Thanks.

Divergence theorem.

Look it up.

Sorry I don't understand that either. At least can you clarify for me
what "spherically symmetric" means? Would a mass system of 6 points
which are at the center of a cube's faces be spherically symmetric? I
could add just 6 vectors and see where my simulation went wrong..
.

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