Okay, I've looked over all of my formulas numerous times and I just can't figure out what to do for these two: In terms of Earth radii, how far from the center of the earth would you have to travel in order to cut your weight from 900N to 300N? The gravitational force between two electrons 1m apart is 5.42x10^-71N. Find the mass of an electron. Could anyone help me out here? I'm trying to figure out what to do, but I'm just drawing blanks.