# Search results for query: *

1. ### Gravity in 1-D torus

Thank you for the replies. It seems that what I'm trying to is impossible. My main goal was to create an n-body simulation. But I need limited space, the space cannot go to infinity in all direction. My solution was to wrap it up like a torus. Which then poses the question, how would gravity...
2. ### Gravity in 1-D torus

I am trying to make understand gravity on a flat 2-D torus. To help myself get my head around it, I simplify the problem into a 1-D torus. Let's have a 1-D space (or line). Instead of the left part of the line going infinitely to the left and the right part of the line going infinitely to the...
3. ### What is spin for neutral particles

does neutron have magnetic moment due to non neutral quark? Umm... thanks fredrik, I checked ur link but... I don't really understand it. So, for all purpose and intention, spin is just a vector that all elementary particle has, and it obey angular momentum commutator relation? And it arise...
4. ### What is spin for neutral particles

I understand that an electron spin is intrinsic. We call it spin because electron has a magnetic moment, which would be naturally produced if the electron is physically spinning. All we know is that for whatever reason, electron has a magnetic moment. My question is, how do we know if neutral...
5. ### Wave particle duality as applied to photon

so, a single photon cannot be described as an EM wave? I mean I fully understand the idea that particle is a matter-wave. I am doing QM so it is pretty familiar. The problem is I that I cannot yet reconcile the idea that a matter wave is an EM wave as well. I have no idea what that means.
6. ### Physics Major's Questions on Geodesics

so, combining the two response, the light curve and follow the geodesic? (I mean how would it is understood so as to be able to be applied to GR and SR ) how about if there is a kink in the circle? thank you.
7. ### Wave particle duality as applied to photon

so basically a wave particle duality principle state that sometimes a "matter" would behave as a particle and a wave a another time. The was to reconcile this is through QM's statistical interpretation and the math construct is very obvious that such proposed matter is indeed a wave-particle in...
8. ### Physics Major's Questions on Geodesics

I am sorry with the bad title and I am physics major with very weak math. So I come to the forum to rescue me. Basically I have one question, what does a "point-like creature" on a one dimensional line "sees" on different geodesics? if the line is flat, then the creature can sees everything on...
9. ### What makes schrodinger cat quantum?

I see, double slit experiment for one particle at a time shows interference for a probability wavelet. I understand this experiment quiet well but still I wish for something simpler. One last question, I am always wondering, what if I do a double slit interference in a cloud chamber, will we...
10. ### What makes schrodinger cat quantum?

Thank you to SW VandeCarr, Demistifier and Adrian59, really appreciate that. So a particle is basically a solution to a Schrodinger equation, which is a wave or a wave function. It simply for some strange experimental reasons that what we observe is actually a blimp on a screen which looks more...
11. ### What are the implication of Einstein's definition of space time?

1. I think I understand this one quiet well by now 2. when I said gravity wave, I wasn't talking about graviton, sorry for not clearing this up, I was talking about gravitational radiation such as caused by distant binary star systems. 3. I think this is clear to me by now that he answer is...
12. ### What are the implication of Einstein's definition of space time?

I slowly began to understand that physics take hard work the hard way, and its hard. thanks for the reply everyone 1. "fine structure constant" never heard of that, yet. And when I said different value of permittivity and permeability, I was thinking about glass and water but I have a hunch...
13. ### What makes schrodinger cat quantum?

I do consider that and my knowledge will eventually evolve be at that state. But for now I am not and I hope through this forum I could achieve firm basic understanding of the foundational principle of quantum mechanic, such as superposition, with my current technical and mathematical skill...
14. ### What are the implication of Einstein's definition of space time?

I know the answer is many, some of them I already understand very well, time dilation etc, some other I might be able to grasp the idea (like light cone) and I will not be able to understand some others (i can't name it because i don't know what i don't know) I am a 2nd year physics major...
15. ### Discretization of Lz: Does m Have to Be Integer?

if this happen to be an isolated system? just the atom and nothing else? will it be random?' actually if there is a magnetic field, the atom would precess am i right?
16. ### What makes schrodinger cat quantum?

ok look sir ZapperZ, i understand you are in this heated debate. but for me who just study the QM at the very surface, none of your 'evidence' (bonding-antibonding, coherence gap in the Delft/Stony Brook experiments) actually help my understanding. for me to understand the implication of...
17. ### Discretization of Lz: Does m Have to Be Integer?

wow yea thanks so much zenith8. I understand very well why such explanation is banned and now I think i have a much better idea about this. and the whole idea of switching or tilting axis. and now I want to make sure I do have the correct understanding regarding the even more basic...
18. ### Discretization of Lz: Does m Have to Be Integer?

Sorry Fredik but I do not understand anything past your second sentence. I think I must have slacked too much in my physics class.
19. ### Charging an Insulator: Explained

oooh ic thanks every1
20. ### Charging an Insulator: Explained

I thought photoelectric effect only happens in metals?
21. ### Discretization of Lz: Does m Have to Be Integer?

and so, Nick89, does it means that if I tilt my Lz value into Lz', then i simply not know any of all 3 values, Lx Ly and Lz, but only Lz'?
22. ### What makes schrodinger cat quantum?

"To me, when you CAN write such wavefunction then there are observational consequences that can be checked."ZapperZ and what are those observational consequences might be?
23. ### Charging an Insulator: Explained

aha ic, so its surface chemistry, there were chemical reaction these things were never taught in high or first year physics, no wonder i don't understand at all. thanks
24. ### Charging an Insulator: Explained

I feel so ashamed to ask a question this simple, but how does an insulator get charged? Let's say rubbing a glass rod with cat's fur. I thought that insulator means there is no free electron. Does rubbing means turning the neutral atoms at the surface of the glass rod into ions? or...
25. ### What makes schrodinger cat quantum?

I am sorry but I think it helps me if I ask the question this way: Assume that coin tossing is quantum and super position applies. What should we expected as the result of that assumption? in other words: beside the absence of evidence, what is the proof that coin tossing is not quantum...
26. ### Discretization of Lz: Does m Have to Be Integer?

put it this way I can think of a scalar, having a discrete value, like energy for instances. But yet I cannot think of a vector having a discrete value, not only in magnitude, but also in direction. From my point of view, the symmetry just collapse. Its like having a symmetrical system with...
27. ### Discretization of Lz: Does m Have to Be Integer?

I just learned about L and Lz, I can accept the fact that L is discreted in quantum world, but it does not make sense at all for me that Lz too is bound in term of m multiple. I mean, if we choose an axis that is tilted just a little bit, then our value for Lz changes immideately and m is not an...
28. ### What makes schrodinger cat quantum?

so a half alive half dead cat only exist in the qunatum mecahanist's mind mathematically, there is nothing wrong with it, physically, it predicts the trends properly and that's just it?
29. ### What makes schrodinger cat quantum?

I am at the point where quantum mechanic make sense, yes i can understand the cat being in the super position of life and death. what I don't understand is why we ended up at this conclusion instead of just assuming for hidden variable?
30. ### What makes schrodinger cat quantum?

@irrational: yes i know that the cat is not 'quantum' per se. so the copenhagen interpretation is merely and interpretation? its not proven yet? I am currently too busy to open the links but thx. and thus, the exact process of collapsing is simply currently unexplainable?
31. ### What makes schrodinger cat quantum?

Hi I am learning quantum physics in 2nd year i want to know what makes Schrodinger cat quantum? how do we ended up in the Copenhagen interpretation? i.e. probability density function = 0.1; 0<x<10; =0 everywhere else we could say that the particle is simply moving very fast (ignoring...
32. ### Dynamic meshing open foam

Homework Statement does any1 know how to make dynamic mesh on open foam? Homework Equations The Attempt at a Solution i can't find any yet.. thx
33. ### Understanding the Cat in a Box Paradox

Wait, I don't understand anything... the cat in the box is under superposition, okay. So in QM, what is the significant, and if you want to say something very technical like, the bell, phenomena, or whatever it is, can you please give more explanation, I am not really into these sort of things yet.
34. ### Understanding the Cat in a Box Paradox

I just learn the cat in a box paradox, where we cannot know whether the cat is dead or alive until we open the box, so the cat is in a superposition between life and death. yup, got it! I am about to learn quantum physics. And I think it would be really good if I got a grasp of it first. So...
35. ### Is 1,9,25,49,81,121 a Sequence or Series?

hey, first of all you have to proof that 1,9,25,49,81,121 is a sequence with a pattern of some sort, or is it to obvious? well at least then comment on my answer.
36. ### When sun is gone, gravity of light, which one faster?

I know that it took approximately 3 minutes for lights to travel from sun to earth. Let say the sun is gone now. Like erased, click-n-drag out of the universe in an instant! So until 3 minutes later, no one on Earth would realize it, because nothing travel faster than light! But, could I argue...
37. ### Speed of Theoretical Wave: Constant Regardless of Frame?

so the wavelength is defined by the medium, that's new! sorry Ich, but I have no idea what you are about. pardon me but not every one here, especially me, got a degree in physics. hummm could I define such a wave? I might... 1. I am not sure, a gravitational force wave, where there will be a...
38. ### Speed of Theoretical Wave: Constant Regardless of Frame?

In a theoretical wave that does not need a medium, not necessarily EM. the speed of the wave is given by : v=fl where f is frequency and l is lamda, wave length suppose there is a stationary wave generator, we can easily measure f and l from any arbitrary point. if we move towards the...
39. ### Is 1,9,25,49,81,121 a Sequence or Series?

is this a sequence or a series? 1,9,25,49,81,121 it could be both 9=1+8x1 25=9+8x2 49=25+8x3 and so on 1=1^2 9=3^2 25=5^2 49=7^2 and so on
40. ### Charges in conductor and insulator

so its a fuzzy logic thing? that conductivity is about how quick the charge could move?
41. ### Charges in conductor and insulator

I don't think emitting with beta radiation will make it uniform, unless the object is very thin. so when i charge anything, i only give a surface charge which any object possess, in conductor, the object itself absorb the charge in the surface, hum... that's better. I think it can be done using...
42. ### Charges in conductor and insulator

that way, could i conclude that in electro static, an insulator behave in a same way as a conductor?
43. ### Charges in conductor and insulator

I am thinking that if i take or add charges from an insulator, which is most probably done at a section of the surface, the charge have to move to the insulator, along the surface and spread themselves. and the same will apply for removing the charges. they have to move, don't they?
44. ### How'd they figure that? (logic puzzle)

hey but before all of that, could you just explain the problem in a simple way first, they you can all argue about the detail. i kinda get it... that because after 200 days, the green found out that they must be green. but if these people can count, and these people think too much. they could...
45. ### Charges in conductor and insulator

by definition, a charge cannot move inside an insulator and by a similar definition, a charge can move inside a conductor. so, I don't understand how do we could charge an insulator, the charge cannot move, or there is something that i missed?
46. ### Why is the magnetic field of a wire circular?

I should say that they are in deed opposite. 1 case, the earth: the current is circular around the latitude of the earth. 2 case, the current: the current is straight inducing a magnetic field in the 'latitude' of the wire.
47. ### The definition of living beings

so mqb_phys, is the conclusion is that there are currently no such definition that i demand? no solid definition that can't be argued against? and thanks for explaining the joke, I found it hilarious for a modern society to ban a teaching.
48. ### The definition of living beings

Actually, it is not that I do not know what is living things. it is that I am just unsatisfied with the current definition. I know my question could be annoying to most people, so I tried to be careful, but sometimes it just can't be help. so I am sorry. Moridin, are you sure that your...
49. ### The definition of living beings

sorry I don't get, the jokes (1) >.< I am not from USA or anywhere near So a living things is a thing which is able to inherit characteristic. how about a infertile organism (due to many reasons like, accident or sickness or old ages), are they a living things? And when a living things stop...
50. ### Misc. Double slit - do it yourself?

I did that one with microscope slide and candle soot, also with CD. And both succeded. I did it in school as one of my lab. with CD it was very easy, with candle soot, it was a bit difficult. I also did it with sound by using two big speaker distanced few meters apart in open areas. And the most...