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| Thread ID: 56586 | 2005-04-09 07:54:00 | E=mc(c) | Renmoo (66) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 343134 | 2005-04-09 07:54:00 | Greetings PressF1, contrary to my thread on teleportation, I would like to ask a question. In Physics, for the letter E in E=mgh, there is a subscript of p for it which stands for "potential". In kinetic energy formula, E=0.5mv(v), there is a small letter k under E, which is an acronym of "kinetic". So, what subscript do I have for E=mc(c)? Thanks and Cheers :) | Renmoo (66) | ||
| 343135 | 2005-04-09 08:47:00 | what is the question asking? | Prescott (11) | ||
| 343136 | 2005-04-09 09:12:00 | I would say 'r' for radiation Look here for my reasoning (www.wbabin.net) |
Myth (110) | ||
| 343137 | 2005-04-09 09:37:00 | It isn't usual for E to have subscripts p or k. Maybe it is your particular physics reference that is using them for clarity. Energy is energy, to find the velocity of a body falling through a height h, you would equate kinetic energy 1/2mv² to potential energy mgh for example. Edit: Incidently mythix's reference illustrates why some people think Einstein wasn't all he was cracked up to be. He pliagarised other peoples work without refering to what had gone on before. |
Terry Porritt (14) | ||
| 343138 | 2005-04-09 11:05:00 | what is the question asking? Sorry, Prescott. I am asking for the type of energy posseses by E=mc(c). Sorry for the confusion. Cheers :) |
Renmoo (66) | ||
| 343139 | 2005-04-09 13:43:00 | These subscripts must be your particular textbook/teacher's notation. There are no 'types' of energy, energy just 'is'. That said, I'd guess it would be E subscript m, for mass. |
Rugrats (6953) | ||
| 343140 | 2005-04-09 20:56:00 | The "subscript" which doesn't exist would refer th "mass energy" or "binding energy", which refers to the mass deficit (m) used to calculate the value. | somebody (208) | ||
| 343141 | 2005-04-09 23:40:00 | Perhaps a bit of basics, the units of all physical quantities can be expressed in terms of Mass, Length, and Time, M, L, T. Energy, in whatever form, has the units of work, M.L².T-² Temperature is also a measure of average energy of atoms/molecules, so also has the dimensional formula for energy, though it is convenient to refer to scales of temperature, like °K. |
Terry Porritt (14) | ||
| 343142 | 2005-04-11 06:55:00 | These subscripts must be your particular textbook/teacher's notation. There are no 'types' of energy, energy just 'is'. That said, I'd guess it would be E subscript m, for mass. So, from your view, can mc(c) = 0.5mv(v) ? Cheers :) |
Renmoo (66) | ||
| 343143 | 2005-04-11 08:26:00 | So, from your view, can mc(c) = 0.5mv(v) ? Cheers :) You can't do that James, because you are confusing rest mass m*, the mass when the velocity is zero, with the relativistic mass m. Relativistically we have: m= m*/(1-v²/c²)½ So that when v is small compared with c, total energy E = m*c² +1/2m*v² |
Terry Porritt (14) | ||
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