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so take 2 black holes, with say 100 solar masses. A is not spinning, B is spinning at relativistic speed. At a point far enough away where the space can be treated as flat, where the Newtonian gravity applies

is the gravitational force is the same for A and B, or does the spin rate of B increase the mass number you would use for the Newton formula?

Tried to look at the Schwarzschild metric vs the Kerr (which is difficult as the units seem to be all different), and notice that the Kerr contains the Schwarzschild radius, r

_{s}as an input, which implies that the Schwarzschild radius is the same for A and B? (from the wiki article)

then the only difference between a spinning and non spinning black hole would be the curvature effects surrounding the event horizon?