Physics

Obviously light bulbs don't shatter, but my questions is, why DON'T they? What specifically prevents the higher external pressure from caving in the bulb? ~ee

This thread was inspired by a question asked in a thread about stored energy where the question was asked if energy could be stored in a Field. Since this was really a bit off topic in that thread and an important subject people are always asking about this and the nature of Fields in general here is a thread for folks to discuss the subject and ask their questions. For reference I described a Field this way in that thread. So the quick answer to the first question is yes if the field property is suitable, no if the field property is not. In order to illustrate this and another important question - What are the differences and similarities betwe…

I know what is the current definiton for one second but I just can't understand how can scientists change the definiton to a "better one". Therefore my question is how the currently used definition cannot be the most accurate one? Thank you for your time and help!

A 1k body is totally isolated in its own universe. What is its temperature, consistent with the laws of Physics?

I think “Space” should have its own thread here at SFN. I want to do a lot of reading on space. Such topics as: · Space Simulators · Space Dynamics · Terraforming · Mining Space · Space Station Design · Moon Bases · The Apollo Computer · Space Navigation · A Video Game of Space similar to Mine Craft But I have a question that relates to space. And is more serious than it sounds: When the Enterprise goes warp speed how does it avoid objects in space, such as comets, dust, and planets? …

As Max Tegmark expressed in a youtube video here, physicists have long neglected to define the observer in much of the equations. (The observer being the intelligent agent) Perhaps consciousness may be defined in terms of very complex equations, from disciplines, like Physics; as an example, degrees of general structures such as manifolds central to physics and mathematics, are now quite prevalent in the study of Deep Learning.

I need to come up with an idea of how to get water from the air. Does anyone have an idea of some I can built. Please help

Probably I should know the answer, but I have doubts... There is a very long tube (pipe), say 2 km long and 3 meters in diameter. The tube is open at one end and there is a stationary air inside and outside the tube at normal pressure and temperature. At the other end of the tube there is a piston. At one moment the piston starts moving with some constant velocity (much lower than the speed of sound) something like 5m/s. My question is how long does it take that the air at the open end of the tube starts moving at speed comparable to the piston speed? My guess is that this would happen quickly (comparable to the time sound needs to travel the distance). Am …

Is the collapse of the wave function a real physical process or an epiphenomenon due to the Uncertainty principle?

(posted in this subforum as I couldn't see where else it might fit) I have searched around on the net and see that this is a question that has been asked often before and the answer is invariably that ; "no,there is no theoretical limit to the rate of acceleration that can be achieved." (not real quotes) If we take a unit mass (is there such a thing? If not can we set mass at a randomly chosen constant ?) can we say that this mass is then subject to a maximum rate of acceleration? Since I imagine that mass may be a term that applies to a system rather than any one particular object then I guess I am asking whether a given s…

My father is still convinced that some thing cannot come from no thing. He says that's the definition of no thing. But is it true? Can some thing really come from no thing? Is there even such a thing as a 'no thing'?

Heres the situation, I'm in a argument with a genuine geocentrist (yes, they still exist) who claims that Special relativity cannot be true because http://web.stcloudstate.edu/ruwang/PRL93.pdf this experiment proves it is wrong, he also sent me this handy video . so i sent him http://www.mathpages.com/home/kmath169/kmath169.htm this paper showing him how it works. the problem arises when he responds again with this:"The paper measures light speed relative to the wheel axes instead of relative to the observer that made the measurement."It only seems to be you who is making that conclusion"No, there are many physicists who agree that that paper is wrong. I already debunked…

The Kondo effect results from a relationship between electrons known as "entanglement" in which the quantum state of one electron is tied to those of neighboring electrons. This entanglement between electrons arises in a metal with an impurity, at a temperature close to 0 K..https://en.wikipedia.org/wiki/Kondo_effect How can electrons become entangled (spin correlated ?) because of a low temperature?

Intriguingly, here is a Google Deepmind paper (September 2016) that like the paper of mine, entitled "Thought curvature" (May 2016), considers combining translation invariant, and translation variant paradigms (i.e. disentangling factors of variation), particularly in the regime of reinforcement learning, causal laws of physics, and manifolds: https://arxiv.org/abs/1606.05579 Separately, "Thought curvature", describes algebra that utilizes super-manifolds, instead of merely manifolds. Given particular streams of evidence..., is a degree of the super-manifold structure a viable path in the direction of mankind's likely last invention, Artificial General Intellige…

I have some questions about the kind of math involved in some physics equations . Someone said many physics equations involve Ordinary and Partial differential equations What sort of Ordinary or Partial differential equations are involved in Maxwell equations and Schrodinger equations ? These are some rough notes i made while trying to learn differential equations and programming I am not sure if the things i wrote down are right ? What does the variables in those equations represent especially in the Maxwell and Schrodinger's equation? I can't understand much by looking into Wikipedia .

I read that when Einstein first proposed in 1905 that light was quantized (i.e., that quanta were actually real, as opposed to the heuristic that Planck had considered them to be), the scientific community was "highly skeptical." Yet of course it turned out to be so and quantum theory "changed science." Relativity was a major change of outlook as well. Do we think the remaining things we don't fully understand will require such radical "retooling," or is it likely that those two were the big ones and the rest will involved less thoroughgoing alterations? I read that obtaining a quantum theory of gravity is one of the major remaining difficulties - are there any oth…

Ladies and Gentlemen I have unraveled string theorie ! The supposed "thring" is actually a circle. It is a circle on which reside the many supposed "parallel" universes. The universes sit on this circle or, Ring. They are not parallel AT ALL. This ring used to look like a messed up string, because of all the mess in the universes. Now it has finally gone back to it's original ring form. The many universes sit on this ring. Our universe sits on the most top of the ring. The Gem of the Ring. --------- The ridiculous notion that the string is started from a particle is absord. Copyright Eldad Eshel All …

Are we living in a simulation?

Notably, that we live in a simulation is not empirically observed, but there are efforts such as digital physics, that may generate answers. Intriguingly though, as we simulate more stuff with higher and higher fidelity, (the idea that a universe with conscious entities can be simulated) gets less and less crazy. High fidelity (4k) 3d simulation: A cool video discussing simulation, by fellow with Morgan Freeman like voice style: Another cool video discussing simulation, by fellow "robot" SciencePhile for the Ai: Anyway, I recall of this old, and amusing guideline, on how to li…

Often hearing the same songs played on many different radio and television stations, I've wondered how any song always sounds the same, even though it is delivered on the many different frequencies that the different broadcasters use. Why don't those different wavelengths affect the original sound of the song? ( Thanks to Led Zeppelin for the thread title ).

Hi. Lightning rods, with their properties of attracting and providing a safer electrical path to ground have their advantages to prevent a house to burn or the unpredictable damages caused by a lightning bolt. Is there any cons; like -say having them installed will promote more hits to the dwelling rod, instead of less hits that may be diverted to nearby trees or other buildings ? Would the hits be much less destructive, but more frequent ? For the brutal voltages involved; would a plain reinforcement iron bar as rod and path to proper grounding instead of a 1/2" copper path be reasonably comparable ? A 1/2" 'rebar' tiny additional resistance to the brut…

Video by David Butler, This video is one of the best I have come across, that explains empty space/force fields & their particles/quarks/Higgs boson, it has helped me better understand the concept of fields/spins..in terms most will understand/enjoy.

Is there anything that can be seen or filmed that can pass through solid objects?

there is no time. just force.

Part A - Artificial Intelligence and human-kind, in 2 sentences. Artificial Intelligence is unavoidably exceeding humans in cognitive tasks, and some projections observe human level brain power in artificial machines/software by at least 2020 (Wikipedia exascale computing source). Artificial Intelligence is already solving many of human kind's problems. Part B - Crucial difference between Edward and Tegmark Edward Witten is quite the human being/physicist. Max Tegmark is also, quite the human/cosmologist. Both have phd physics degrees. The urgent difference? (1) Max presents consciousness as a math…