Timeline for How Energy can be real if C² isn't real? (E=MC²) [closed]
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 30, 2015 at 23:29 | review | Reopen votes | |||
| Sep 30, 2015 at 23:49 | |||||
| Sep 30, 2015 at 23:10 | history | edited | lopata | CC BY-SA 3.0 | added 77 characters in body |
| Sep 27, 2015 at 16:29 | comment | added | dmckee --- ex-moderator kitten | Related: physics.stackexchange.com/q/18250 | |
| Sep 27, 2015 at 14:57 | comment | added | Timaeus | $\vec v=c^2\vec p /\sqrt{(mc^2)^2+|c\vec p|^2}$ which is less than (or equal to) $c$ since $c\vec p /\sqrt{(mc^2)^2+|c\vec p|^2}\leq 1.$ And $|\vec v|=c$ when $m=0.$ Finally, $c^2$ and $c$ have different units so it is wrong to compare them because to which one is larger depends in your unit system. If you use mks then $c^2$ is numerically bigger than $c$ but if you use natural units they are numerically equal and if you use lightyear per hour then numerically $c$ is bigger than $c^2.$ | |
| Sep 27, 2015 at 13:58 | history | closed | Bill N David Z | Needs details or clarity | |
| Sep 27, 2015 at 13:47 | review | Low quality answers | |||
| Sep 27, 2015 at 14:03 | |||||
| Sep 27, 2015 at 13:25 | comment | added | HDE 226868 | If you're asking why $c^2$ gives a greater value than $c$, and that means that there is a quantity greater that the speed of light, then the error is interpreting $c^2$ as a speed - which it isn't, if you look at the units. | |
| Sep 27, 2015 at 12:45 | answer | added | Syed Jaffri | timeline score: -1 | |
| Sep 27, 2015 at 12:45 | comment | added | Apoorv | It is unclear what you are asking. c is a real number and a universal constant and so is c^2. It is always permitted to square real numbers. | |
| Sep 27, 2015 at 12:39 | comment | added | Qmechanic♦ | Real in what sense? | |
| Sep 27, 2015 at 12:34 | answer | added | rdhox | timeline score: 3 | |
| Sep 27, 2015 at 12:23 | comment | added | peterh | You should try to come out from the hypotheses and preconditions created for yourself. | |
| Sep 27, 2015 at 12:20 | history | asked | lopata | CC BY-SA 3.0 |