| 41. | For a particle of rest mass, the " total " angular momentum tensor is:
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| 42. | Only " rest mass " is loosely equated with matter ( since it can be weighed ).
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| 43. | Photons are uncharged particles with zero rest mass, and hence travel at the speed of light.
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| 44. | Moreover, under Lorentz transformations, this relativistic mass is not invariant, while the rest mass is.
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| 45. | Allowing to be expressed in terms of the energies and rest masses, or momenta and rest masses.
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| 46. | Allowing to be expressed in terms of the energies and rest masses, or momenta and rest masses.
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| 47. | Note how the final result depends only on the rest masses which are independent of the referencial used.
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| 48. | Where m _ 0 is the rest mass ( which, by definition, is a constant ).
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| 49. | Empirically, since the light quarks actually have minuscule nonzero masses, the pions also have nonzero rest masses.
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| 50. | Measuring the mass ( by measuring gravitational attraction ) of the objects near them gives their individual rest mass.
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