Thursday, December 31, 2015

Is velocity of light constant?




There is a difference between the concept of the speed of light and the velocity of light. are both of them constant (dc=0 and dvc=0)? if yes, why?.




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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 \...