: : Can some one please explain this formula to me:

: : Mb=Co^3/2(pi)GPo^2

: : Where Mb is black hole mass. Co is black hole : : Circumference. And Po is period of orbit. How do I find : : Po, and how do I apply G, Newton's Gravitational constant. : : Any help would be appreciated. -Nate

: nate - not sure if I can help, but it looks like a "plug & chug" equation to me. If you know the BH mass and everything else already, just rearrange the known numbers and solve for Po. However, I don't recognize the equation, and wonder if there might not be some additional parentheses that might help to show which factors are actually on top or bottom of the equation. Finally, in every equation I have seen with G in it, there at least two masses mentioned with gravitational "attraction" to each other. If you have the BH mass on one side, you probably need the mass of the orbiting body somewhere on the other...no?

I saw that eqn on a diff. address. It used to FIND the mass of a black hole. Everything on the right of the equation should be given (assuming you have all the equipment) and then calculating your results should give you the mass. I dont know if this answers your quesion, or if I merely restated it.

• Re: Black Hole Formula - Angel/">Angel - June 9, 1999 - 14:52 UTC