Recent content by calfly

Ah I think I'm starting to get it but I'm making a math error somewhere i think, okay so I set f = mg = -Gm1m/r^2, cancel out "m", --> g=-Gm1/r^2. now I got to fit that into sqrt(2Gm/R) but that does not get sqrt(2gr)? err i think.

err, I think this is where I'm stuck at. if an object is right on the surface of the Earth then I guess the gravitational force would look the same as the general equation-ish F=-Gm(earth)m(object)/R(earth)^2. I'm not quite sure what I'm looking at when I set them equal to each other.

F=-Gm1m2/r^2

Homework Statement I'm having a hard time relating the escape velocity equations, sqrt(2GM/r) to sqrt(2gr) The Attempt at a Solution I know that both equations mean the same thing, but I can't figure out how to get from the first equation to the second