Tuesday, December 19, 2017

quantum mechanics - What is the spreading for rectangular wave packets?


I know the spatial width for rectangular wave packets, but what is the spreading for a rectangular wave packet?




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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 \...