Sunday, August 12, 2018

spacetime - Is simultaneity well-defined in general relativity?


In special relativity for each event and reference frame we can find a plane of simultaneous events.


I wonder is it possible to do the same in general case in curved space? Is simultaneity even meaningful in GR?





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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 \...