Thursday, May 26, 2016

time - Why do atomic clocks only use caesium?


Modern atomic clocks only use caesium atoms as oscillators. Why don't we use other atoms for this role?




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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 \...