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dimension, geo dynamo, magnetism, electricity
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by
on 2006-11-26 15:54:06 |
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Hey, I have several questions, which I'm asking now after reading other threads that seem to have been replied with dependable answers. 1) First about dimension, my friend told me that some guy explained 3d, 2d, 1d, etc. with the example of a light bulb shining on a small cube right above it, shadow, etc. Does anybody know about this & could anybody explain that to me? 1 b) Also, another friend told me that at subatomic level matter appears and disappears randomly at any point in space within the 90% probability circle or something. Is that from human perspective (b/c stuffs move around so fast), or does matter really "transport" through space? 2) Could anybody explain to me the feedback effect in the Earth's core? 3) On magnetism, is there any chance that the two might be related, although textbooks say they aren't? 3 b) Also, I see dusts that form around electronic hardwares. They are magnetically "charged", right?
:< :> :0 :) :( :?
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Re: dimension, geo dynamo, magnetism, electricity
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by
on 2006-11-26 16:56:50 |
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1a) I have never heard this before, but it sounds like this might help you. 1b) No, this is wrong. All fundamental particles observe the Uncertainty Principle, meaning that we can not know their position and velocity with precision at the same time. you can, however, contain a particle in a small box. When you do that, you narrow down its position, making its velocity less known. By squeezing down a particle into a tiny space, you can therefore see it jiggle on the order of an angstrom. This is not transportation or anything magical, its just jiggling. 2) I have no idea what your talking about. I should think the Earth's core needs no feedback system, since it behaves according to its rotational moment of inertia. But, I'm no geologist! 3a) This is not a question, it is a sentence fragment. 3b) Dust is made mostly of dead skin and hair. Molecules of dust probably have some electric polarity (not to be confused with magnetic polarity). This does explain why they stick to a sweater that has just come out of the dryer, and is statically charged. It also may explain why they stick to your computer case. Although, it seems more likely that dust builds up on computer parts in a depositary manner, like sediment in a river bed. This is because air is constantly being pumped through the case by the fan for cooling. 
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Re: dimension, geo dynamo, magnetism, electricity
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by MiCHiYo μ
on 2006-11-30 03:49:03
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okay, i see that FMPfan has edited his post, but i still don't understand his number 2 question. anything to do with gravity perhaps? please clarify. on magnetism: (number 3a) WHAT two??!!?!?! -michiyo- 
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Re: dimension, geo dynamo, magnetism, electricity
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for 2 i think he's talking about 'the feedback effect' and magnetism i found this: "Over 99% of the Earth's magnetic field is confined to the core, where the complexities of the fluid flow means that there are constantly changing smaller magnetic fields, which may be aligned differently from the large-scale geomagnetic field. Some of these seem to be growing very fast right now, and it is speculated that a positive feedback effect could amplify them till they cause the current north-south dipole to break down entirely." at http://plus.maths.org/issue20/news/dynamo/index.html hope it helps |
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Re: dimension, geo dynamo, magnetism, electricity
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by kudoushinichi
on 2007-12-23 00:37:33
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Question 1b) caught my attention... Is your friend taking A-Levels Chemistry? Because in my Chemistry A-Levels textbook, there is one part where the book is trying to explain electron orbitals. It uses the hydrogen atom as an example. The hydrogen atom has only one electron which is in the 1s orbital. The shape of the orbital is spherical with the nucleus of the hydrogen atom at the center. Then the book continues to explain that actually, the electron can be anywhere in the universe (but the book never mentions the Uncertainty Principle - maybe because they don't want to confuse the students). But that sphere in the hydrogen atom is where the electron is most likely to be. The book concludes that an electron orbital can be said as 'a region of space where the electron spends 90% of it's time'. I know that this isn't entirely correct, but that is what the book says. I could smell Gendou's wrath if he ever reads this. Btw, the layout for X-mas is really shocking! Haha!
Shinjitsu wa itsumo hitotsu!
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Re: dimension, geo dynamo, magnetism, electricity
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by
on 2007-12-23 03:20:57 (edited 2007-12-23 03:22:54)
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I don't think that the chemistry book is in disagreement with what I said. Saying that "the electron orbital is the region of space where the electron spends 90% of it's time" is the definition, and I can't argue with that. What I have a problem with is the other part, the "matter appears and disappears randomly" part. Sure, an electron has some non-zero probability of tunneling to any point in space. It is not, however, possible for it to violate Einstein's theoretical limit on the propagation of information. You will NEVER measure an electron first here, then over there, if it's having traveled the distance in that time were impossible. The question "did it really travel from point A to point B" is meaningless in this example. Don't worry, though, stuff doesn't HAVE to either travel from point A to point B or NOT. It is sometimes sufficient to say only that it was at point A then and B now. The book doesn't state any incorrect facts, his friend did. I simply pointed out the flawed detail. Fear my wrath?
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Re: dimension, geo dynamo, magnetism, electricity
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by kudoushinichi
on 2007-12-23 04:03:23
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Fear your wrath? Perhaps, because when you point out people's mistakes you do it vehemently and it makes me somewhat uneasy (although one admires your passion). Part of my life depends on this wonderful site. And usually you do not want to upset the owner.
Shinjitsu wa itsumo hitotsu!
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Re: dimension, geo dynamo, magnetism, electricity
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| Gendou reminds me of my physics teacher |