Saturday, March 25, 2017

optics - If everything is made up of atoms why doesn't every thing look the same?



At a small scale everything is made up of atoms. Then why is it that objects can have different colours? and why are some objects soft and others hard?




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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 \...