| 11. | :Except that explanation is wrong because a photon has no rest mass.
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| 12. | :: : Gravity is a combination of rest mass plus kinetic energy.
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| 13. | That's any object with a rest mass, not just electrons.
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| 14. | I assume this is somehow covered under GR since photons have no rest mass?
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| 15. | :A photon doesn�t have rest mass, but it still has relativistic mass.
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| 16. | It is more often accurate because it describes particles and bodies with rest mass.
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| 17. | It obviously can, since rest mass is not fundamentally different from other energy.
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| 18. | Though it is a rest mass energy of the constituents of matter is also counted.
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| 19. | The rest mass can also be neglected.
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| 20. | I believe all the Lorentz style equations require a rest mass or a rest frame.
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