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The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

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Centre of Energy in Special Relativity

If we refer to the Coleman, Van Vleck article cited in your excerpt from Griffith, we can use the stress-energy tensor $T^{\mu\nu}$ to derive the relation. First, we know that this tensor is symmetric …
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Special relativity - what's the difference between the two problems?

Remember that you can use also another Lorentz equation. In this case, we are looking at a frame in which two events happen at the same point, not at the same time. Therefore, we must have $\Delta x'= …
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