Tuesday, September 29, 2015

subatomic - Why aren't quarks free?




According to latest modern theory on subatomic particles, electrons and protons are further divided into quarks, having fractional charges.


My question is, why can't they exist independently? and why don't they show up Millikan's experiment?




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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 \...