| 11. | :One key concept is relativistic mass.
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| 12. | Because the relativistic mass is pedagogically.
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| 13. | The relativistic mass is the " real " mass in terms of actual behavior.
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| 14. | The relativistic mass of something traveling at " c " need not be zero.
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| 15. | :: I know that, I don't count relativistic mass as true mass.
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| 16. | A fast-moving particle simply has more relativistic mass than a slow-moving one.
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| 17. | If one assumes that the space-time is nearly Minkowskian, the special relativistic mass exists.
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| 18. | This was called the " relativistic mass ", and m called the " rest mass ".
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| 19. | However there will be some relativistic mass ( E = mc?) due to the energy stored.
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| 20. | :: : : The faster something moves, the heavier it becomes ( relativistic mass ).
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