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1. Jan 28, 2016

### verschrankung

Is this the proper formula for calculating the Schwarzschild radius of a black hole?
rs = 2GM / c2
If it is not, or if anyone has one that might work better, could you refer it to me?

2. Jan 28, 2016

### Banker

That's correct.

3. Jan 28, 2016

### verschrankung

Thank you!

4. Jan 29, 2016

### ogg

I'd just add that in Physics now days, M is a systems' rest mass while gravitational effects depend on the total energy. So, the equation is precise only for a stationary mass, I believe.

5. Feb 3, 2016

### PAllen

For an arbitrary system, the M would be the mass measured by considering the orbit of a distant body of known mass. In this sense, the formula is universally true. For a system of bodies still far enough apart so curvature is small (and pressure and EM fields are insignificant), it is approximately the SR invariant mass of the system - which will include the KE of the bodies in the overall COM frame.