| 31. | Is it due to rest mass?
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| 32. | :The rest mass of something traveling at " c " must be zero.
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| 33. | In a comoving frame, the dumbbell clearly exerts gravity as fits a 1kg rest mass.
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| 34. | This contrasts with a massive particle of which the energy depends on its velocity and rest mass.
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| 35. | Likewise, non-material forms of energy can perish into matter, which has rest mass.
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| 36. | The quantity of above is ordinary non-relativistic momentum of the particle and its rest mass.
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| 37. | Where is the rest mass of the particle and is the speed of light in a vacuum.
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| 38. | :: There are two types of particles : those with a rest mass and those without.
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| 39. | This was called the " relativistic mass ", and m called the " rest mass ".
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| 40. | The ratio of mass of a photon to it's rest mass is infinite for example.
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