Question: Material has been observed in a circular orbit around a black hole some five thousand light-years away from Earth. Spectroscopic analysis of the material indicates

Material has been observed in a circular orbit around a black hole some five thousand light-years away from Earth. Spectroscopic analysis of the material indicates that it is orbiting with a speed of (6.6x10^7) m/s. If the radius of orbit is (4.400x10^7) m, determine the mass of the black hole.

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