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Aug
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comment What is the physical meaning of the action in Lagrangian mechanics?
@Nathaniel: It holds for non-inertial particles, yes, since we can derive the equation-of-motion from the Lagrangian. You can find images similar to the one above for particles subject to the Lorentz force here: physics-quest.org/Book_Lorentz_force_from_Klein_Gordon.pdf (A chapter of my book)
Aug
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comment What are the mechanics by which Time Dilation and Length Contraction occur?
Hi, Ruslan. I have updated the answer with the example of the static field of a point charge moving with a constant velocity $v$.
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revised What are the mechanics by which Time Dilation and Length Contraction occur?
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revised What is the interpretation of the Chern-Simons electromagnetic spin density?
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answered What is the interpretation of the Chern-Simons electromagnetic spin density?
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revised What is the physical meaning of the action in Lagrangian mechanics?
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answered What is the physical meaning of the action in Lagrangian mechanics?
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revised Other ways of checking whether particular system result in non-locality
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revised Other ways of checking whether particular system result in non-locality
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answered Other ways of checking whether particular system result in non-locality