Thursday, August 31, 2017

gravity - How do we determine the mass of a black hole?


Since by definition we cannot observe black holes directly, how do astronomers determine the mass of a black hole?


What observational techniques are there that would allow us to determine a black hole's mass?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...