Wednesday, December 26, 2018

special relativity - Why can't a spaceship accelerate for ever? Since there is no friction in space


I have seen many answers like: because we don't have infinite energy, because of gravity, because it is impossible, because of physics.


But they don't really answer my question.. I mean if there is no friction and at some points, even if just in theory, you could be so far away from other objects or at the right distance between many so that the total force vector is null... why is it still considered impossible?




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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 \...