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You can measure proper acceleration locally. Put a mass on a spring balance held at rest with respect to you. Does it register weight...
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Assuming that by “em” you mean “electromagnetic”(although that’s the only kind of photon), then yes, the upper case letter ##E## is...
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Assuming that by “em” you mean “electromagnetic”(although that’s the only kind of photon), then yes, the upper case letter ##E## is...