Wednesday, July 23, 2014

general relativity - Is light affected by gravity? Why?



I would like to know if light is affected by gravity, also, I would like to know what is the correct definition of gravity:


"A force that attracts bodies with mass" or "a force that attracts bodies with energy, such as light"?


Is light massless after all?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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