# Search results

1. ### B Distribution of energy in the electric field surrounding an electron

I am thinking about how an electric field has energy associated with it. If a single electron exists alone in a remote vaccuum, I believe it has it's own electric field surrounding it, and that this field has an energy content associated with it. My question is; does this electric field store...
2. ### I Find the distance between the two apexes of two three-sided pyramids

Thank you for the restatement of the problem, that is much more forward and condensed. I was hoping that, yes, there would be some clever equation, that with enough crunching would fall out and I could simply plug in a set of measurements and always know the tenth distance. It seems that there...
3. ### I Find the distance between the two apexes of two three-sided pyramids

A way to imagine this problem to stand on a plane. You have chosen three points on that plane to create a triangle-base and from these three points you can make distance measurements in any direction. You know the distance between each of the three points of the base, but you do not yet know...
4. ### B Perihelion shift of orbit of Mercury according to General Relativity

Ok, I see. That actually seems cleaner, albeit more complicated. In a final attempt to wrap my head around this, is it safe to say that the velocity of an object has an impact on the geometry of spacetime relative to itself and nearby objects? An example would be a comet traveling at two...
5. ### B Perihelion shift of orbit of Mercury according to General Relativity

I hope I am not taking your explanation out of context here. I cannot help but think of Special Relativity when I read this. Is the reason that the speed of the object changes the gravitational field is because the object's mass increases due to it's approaching the speed of light? The speed...
6. ### B Perihelion shift of orbit of Mercury according to General Relativity

https://physics.stackexchange.com/a/26410 The second answer down the page. He mentions an explanation at the end.
7. ### B Perihelion shift of orbit of Mercury according to General Relativity

So, if I'm to understand the exercise in the above example, the reason the perihelion is shifting is due to geometry? By "creating a cone like bump" somehow the elliptical-like orbital path is shifting slightly as it goes around, similar to the small lost segment of the circle that is being...
8. ### B Perihelion shift of orbit of Mercury according to General Relativity

Recently, when reading an entry about Mercury's perihelion shift, someone mentioned a "hand-wavy" explanation as to why GR predicts the orbit so precisely. I was wondering if there was some elementary way to expound on what he was saying. Fundamentally, the comment said something to the effect...
9. ### From the point of view of a chemist, are there any issues around drinking boiled, concentrated tap water every day?

Recently I have been boiling tap water, for about 30 minutes, everyday for drinking water. The reason I do it is because I don't like the taste of chlorimines and chlorine and this is the only way I know to get rid of them with out also losing minerals. It works great, and in fact, the water...
10. ### I Transparency of a gas compared to a plasma

This is one of the interests I took in the question. In the strange event that a distance and empty field outside of a galaxy would be full of raw proton and electrons, but not be near a star or high energy system, the star light from the neighboring galaxy would be low energy photons, correct...
11. ### I Transparency of a gas compared to a plasma

I imagine an empty region of space, in between stars, or even galaxies. This void is filled only with a uniform distribution of hydrogen particles. I won't specify how dense this field is, but I would like to know which is more transparent to photons, a gas of hydrogen atoms, hydrogen...
12. ### B Is an electron beam affected by photons?

I am wondering if one of the prerequisites of the double-slit experiment, when done with electrons, is that the beams must be in a dark vaccuum tube so as to not destroy the interference pattern. I am trying to learn if the beams will lose their interference pattern because the particles of the...
13. ### B Gravitational signature of a photon in a double slit experiment

Is there some theorhetical explanation of why the "gravitational detector" (admittedly fiction) would also be physcially limited in this way? The explanation I am currently thinking is that the gravity fields are too faint to detect, therefore practically, it can't be done, but in principal...
14. ### B Gravitational signature of a photon in a double slit experiment

Ok, this is where I was hung up. Admittedly, this is all theoretical, but something about it seems peculiar to me only because when I imagine the photon passing the slit, i know there is a faint signature from it's gravity albeit undetectable. If the detector (in principle) were to effect the...
15. ### B Gravitational signature of a photon in a double slit experiment

I'm trying to think of a how the double slit experiment can detect a photon without interacting with it in theory. In principal (not reality of course) does a photon have a gravitational signature which could be used to detect which slit it traveled through during the double slit experiment...
16. ### I Are electro-magnetic waves the same as the wave function?

When studying classical mechanics we are told that light is the propogation of electromagnetic waves. This makes perfect sense, as I can imagine these fields behaving this way, and in turn have an associated wave length. When learning about QM, I have heard that the wavelength of a (any)...
17. ### Electronics Portable Solar panel system to run a small computer fan

Hi and thanks for the replies. I'm not very versed in electronics, and all of the components i have at my disposal are simple usb plug and play parts. I'm probably going to simply charge one battery while the other runs the fan. Or perhaps run the fan off panels while the batteries charge...
18. ### Electronics Portable Solar panel system to run a small computer fan

Hi all. Recently I purchased two portable USB solar panels, which are rated at 5 watts each. They both came with a 'battery bank' consisting of a single battery all running on 5 volts. I also purchased a 5 volt USB computer fan. My question is; can plug all these things in together so that...
19. ### I Measuring the mass of an object near the event horizon of a black hole and observing the results at a distance

Thank you for the indepth analysis and discussion, it is much appreciated. Is it possible to interpret all of the rest mass energy as sourcing from the BH's mass itself, as opposed to the object being lowered? Does this change the math? I'm assuming you can't do this, and the energy is coming...
20. ### I Measuring the mass of an object near the event horizon of a black hole and observing the results at a distance

Is it possible that the force appears to be weaker to the outside observer? Perhaps the acceleration is quicker? I'm referring directly to the experiment that determines the apparent mass of the ball.
21. ### I Measuring the mass of an object near the event horizon of a black hole and observing the results at a distance

It's a little off topic from the original post. It's buried a ways down there, but it really made an impression on me and I'm trying to get a better understanding of what it means.

23. ### I Measuring the mass of an object near the event horizon of a black hole and observing the results at a distance

In a recent thread we discussed the idea that an object slowly dropped into a black hole, can have its rest mass recovered, as energy, if slowly brought to a halt at the event horizon. Once the object is dropped, it would be unrecoverable, and the BH would gain no new mass. I am under the...
24. ### I The release of potential energy between two black holes goes to infinity as they collide?

An after thought; In our hypothetical BH power station, the use of tethers to secure the masses to extract energy would have a tremendous load on them. I believe this tension would become relevant in GR. Should we interpret the masses and their tethers to have some kind of extreme...
25. ### I The release of potential energy between two black holes goes to infinity as they collide?

Just for clarification; is it possible to extract slightly more energy than the rest mass, or is this exactly bound to the rest mass and directly related to it? I'm asking so that I can see that this energy is in fact the rest-mass as it's source, or if it's simply proportional to it (maybe my...
26. ### I The release of potential energy between two black holes goes to infinity as they collide?

So, can we imagine an (admittedly unrealistic) power station that drops weights on tethers into the event horizon (EH) of a black hole? Perhaps done in pairs on each side to keep the BH stationary. The weights could be brought to rest just above the EH, extracting energy, and then dropped...
27. ### B Is Dark matter fact or fantasy

Do we have an idea how spread out it is? For example is it just a uniform 'disc' like cloud slightly larger than a given galaxy? Is it possible that this spreading out can reach all the way out to a neighboring galaxy? The second question would imply that the local intergalaxtic space...
28. ### I The release of potential energy between two black holes goes to infinity as they collide?

Thank you, that answers my question beautifully. Much appreciated. This thread has elevated my understandng of some deep issues I was having surrounding the nature of these things. BTW - I left a very positive review of PF on google earth today. Thanks for the awesome admin work. It doesn't...
29. ### I The release of potential energy between two black holes goes to infinity as they collide?

That was great, thank you so much. I see now how energy is being added to these systems so that A-B can look like C-D and vice-versa. That makes perfect sense. I'm not even going to touch the BHs being a vaccuum :) :D Cheers. Ok, I'm going to try one last inquiry, the reason being is that...
30. ### I The release of potential energy between two black holes goes to infinity as they collide?

My hangup is watching these two black holes approach at high speed (velocity they didn't have before, relative to each other). I'm assuming this velocity is a form of energy and would contribute to the mass of each object as measured by me. Just to clarify, in GR energy is the source of...