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## Homework Statement

How do you find the Angular Momentum, J, if you are given the Angular Velocity, ω of a Kerr Black Hole.

## Homework Equations

J = I*ω

##I = mass*r^2##

Event Horizon:

##r_+ = M + (M^2 − (J/mass/c)^2)^{1/2}##

Static Limit and the Ergosphere:

##r_0 = M + (M^2 − (J/mass/c)^2*cos^2θ)^{1/2}##

where

##M=G*MassOfBlackHole/c^2##

c=Speed Of Light

## The Attempt at a Solution

Unsure where the Moment of Inertial mass radius is.

The Black Hole is not visible to the naked eye.

Is it the mass and radius of the observer or is it the mass and radius of the Black Hole itself that the Event Horizon, Static Limit and all the orbiting Stars, planets,etc. are based on.

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