Recent content by barcafan1990

I kind of understand. I just like justifying everything with equations, which doesn't seem to be working here. Yes I think this is what the book goes on to talk about in a sample problem. Mass of the Earth: M = pVearth = (p4(pi)r3)/3 Thus F = GMm/r2 ...becomes... (4(pi)Gmpr)/3 I don't...

I was reading this very small section in my physics book and can't seem to come to grips with its concept. It starts off with Newtons shell therem being applied to a particle located inside a uniform shell and that the shell exerts no 'net' gravitational force on a particle inside it. It...