Spacetime Physics 评价人数不足
读书笔记 Momenergy
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Yes, of course, momentum and energy are different. Space and time are different too, but their combination, spacetime, provides a powerful unification of physics. Space and time are put on an equal footing, but their identities are maintained. Same for momenergy.
Thus relativity offers us a wonderful unity. Instead of three separate motion-descriptive quantities--momentum, energy, and mass--we have a single quantity: momenergy.

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