Timeline for Can an object falling in vacuum generate electricity by itself?
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Feb 24, 2017 at 13:16 | comment | added | Jim | @annav FEYNMAN IS NOT THE POPE!??? This changes everything! In all seriousness, I'm not taking his word as law. The classical approach contradicts the well observed Bremsstrahlung effect but Feynman's solution agrees with it. That said, I'm now going to also go look more into specifically a free-falling case because most of what I read about was focused on the case of a charge static in a gravitational field | |
| Feb 24, 2017 at 13:11 | comment | added | anna v | @Jim well, Feynman is not the pope. The energy would come from the gravitational field , similar to the synchrotron radiation of an electron in a magnetic field, imo, but I also saw a number of preprints with similar propositions, and no, in these preprints the charged does not fall the same as the neutral. It is a very weak effect because the gravitational constant is very very small | |
| Feb 24, 2017 at 12:45 | comment | added | Jim | @annav your comment made me start thinking about a charged particle static and in free fall in a gravitational field. I did more research than was necessary and wound up finding out that not only does a charged particle NOT radiate in free fall, it also does not radiate in uniform acceleration. We know it falls at the same rate as an uncharged particle (meaning all gravitational potential turns to kinetic). If it were to also radiate, where would that energy come from? Feynman showed it doesn't radiate. | |
| Feb 24, 2017 at 11:23 | vote | accept | Rufus | ||
| Feb 24, 2017 at 0:03 | comment | added | slebetman | Generally the answer is no (though there are creative possibilities as mentioned in some answers) but an object falling means that there is a massive gravity well (been watching too much Expanse) that it is falling into. If it's a planet or a star then there is often a magnetic field surrounding the body. A wire moving through such field will generate electricity. We've tried to harness this several times but each time we tried the wire broke | |
| Feb 23, 2017 at 19:35 | history | protected | Qmechanic♦ | ||
| Feb 23, 2017 at 19:30 | history | tweeted | twitter.com/StackPhysics/status/834847848973922304 | ||
| Feb 23, 2017 at 18:34 | answer | added | PMar | timeline score: 1 | |
| Feb 23, 2017 at 13:35 | comment | added | anna v | I just want to point out that it may not generate electricity, but a charged particle in free fall over the earth does radiate electromagnetic waves , physics.stackexchange.com/questions/13513/… | |
| Feb 23, 2017 at 13:17 | answer | added | Jim | timeline score: 19 | |
| Feb 23, 2017 at 12:44 | answer | added | Floris | timeline score: 20 | |
| Feb 23, 2017 at 11:17 | history | asked | Rufus | CC BY-SA 3.0 |