Posted by Brenda on Thursday, April 12, 2012 at 10:44pm.
If a satalite weighs 90 kg at 10000 miles from the earth, how far away is it when it weighs 10 kg?

earth  Steve, Friday, April 13, 2012 at 12:14pm
since it weighs 1/9 its original weight, and
F = GMm/r^2
and the masses involved have not changed, that means that r^2 has grown by a factor of 9. So, the satellite is 3 earth radii away from earth center, or 2 earth radii high.
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