Monday, June 23, 2014

special relativity - Is the entropy a Lorentz invariant?


So this is the pure question that came into my mind right now.


Is the entropy a Lorentz invariant?


How does the entropy of a gas behaves, when for example it's accelerated at $v = \frac{c}{2}$ or more?




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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 \...