Certainly have NOT forgotten Kepler's 3rd law... I just stated in my original post that I am reading this book as in introduction to physics... I have never learned Kepler's 3rd law. Thanks for the input though.
So... to reply to the others that posted... Is he talking about just gravity and...
Hi,
I just started reading "The Elegant Universe" as an introduction to physics. Up to this point I thought I understood everything but now I get a to a part that doesn't make sense to me and was hoping someone could explain it.
If you have the book you can follow along with what I am...