Saturday, August 4, 2018

cosmology - How do we measure the age of the universe?



How do we measure the age of the universe if time is relative to the observer? What is the reference frame we use to measure the age of the universe?




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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 \...