A little math help please. If I wanted to build a centrifuge to spin a glass disc 12" in diameter to test the thicker at the bottom myth, how many rpm do I need to get approx. 1000G at the edge of the disc? (I have been in an engineering career that doesn't require math for so long I forgot how to figure it out myself and I am too lazy to relearn something that would take someone here a minute to figure out) FYI If I were going to build this (which I'm not), the glass disc would be riding inside a metal carrier (essentially a torus) and not connected to the drive shaft so that the disc was in pure compression. I just want an idea of what I would have to do to simulate a 1000 year time span on the glass (and yes I know I would have to spin it a year if all I could get was 1000G).