Thursday, January 23, 2020

optics - Why do we observe opposite motion of trees (nearer) and trees (distant) when seen from a moving frame?




If you are in a moving train or in a bus, what you observe is that the trees which are nearer to you move opposite to the direction of your motion. But the trees which are very far away from you, appear to be moving along with the direction of motion. Why it happens?




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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 \...