Friday, June 26, 2015

general relativity - How does Newton's 2nd law correspond to GR in the weak field limit?


I can only perform the demonstration from the much simpler E=mc2.


Take as given the Einstein field equation:


Gμν=8πTμν


... can it be proved that Newton's formulation of gravitational and mechanical force (e.g. F=ma) corresponds to Einstein's in the limit when masses are small and speeds are relatively slow?




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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 \...