Friday, August 7, 2015

particle physics - Does string theory and preons exclude each other?


Does string theory contradict the theory of preons, especially the Harari-Shupe one?




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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 \...