Thursday, August 14, 2014

special relativity - Doppler Shift when Light Travels Through Two Different Mediums


When considering the Doppler shift, the 'canonical equation' is f=c+vrc+vsf0


However, this equation seems to run into trouble in the following situation: A light source inside water is moving at a speed v towards a receiver outside the water. Can we modify the above equation to deal with a transition between two media? Or is there a completely different formula that applies here?




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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 \...