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If a satalite weighs 90 kg at 10000 miles from the earth, how far away is it when it weighs 10 kg?

  • earth -

    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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