Saturday, February 6, 2016

general relativity - Negative potential energy of gravity


Does the negative potential energy in the gravitational field have to be considered in calculating the total mass of the system in question (because of $E=mc^2$)?


If so it seems to me that the adding this negative energy to the calculation would slightly diminish the strength of the gravitational force over long distances.




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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 \...