Tuesday, June 9, 2015

biophysics - Why do we (3 dimensional creatures) see in 2 spatial dimensions?



Why do us humans, as 3-dimensional (in terms of space) creatures, see everything in 2 dimensions? Is it because the surface of every 3-dimensional object is 2 dimensional? Or because light enters our eyes through a two dimensional surface? Or another reason altogether!?




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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 \...