apologies if this has been covered elsewhere in the forums, but i was unable to find it. i've seen the usual gravitational force equation [i.e. F=gMm/r^2] with essentially r^3 in the bottom. an example of this can be seen in http://www.mathworks.com/moler/exm/chapters/orbits.pdf [Broken] on pages 8 and 9.(adsbygoogle = window.adsbygoogle || []).push({});

i'm looking for any info [paper/webpages] that might explain how to use this approach, thanks

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# Gravitational force with 1/r^3

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