Posted by Sarah on Monday, March 5, 2012 at 2:23pm.
If the new radius is R, and the earth's radius is r,
.636 * Mmg/r^2 = = Mmg/R^2
.636/r^2 = 1/R^2
R = r/.797 = 1.25r
plug in your favorite value for r, and figure the difference
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