Saturday, April 27, 2019

general relativity - What makes the stars that are farther from the nucleus of the galaxy go faster than those in the middle?


It has no sense that stars that have a bigger radius and apparently less angular speed($\omega$) goes faster than the ones near the center.



Answer



The dark matter or the dark energy.


We don't know at all what are they. We just know that they exist, but as I say, we don't have idea.


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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 \...