Recent content by Maxwell's Demon

Thanks - you're right; I've got a lot of studying to do before before I can understand this. I found a Wiki page that discusses the quantum potential, which seems to be the key term in the quantum Hamilton–Jacobi equation that determines the Bohmian trajectories of particles in the double-slit...

Within the context of the de Broglie-Bohm pilot-wave theory, can anyone explain what the pilot wave is in physical terms? I’m having a hard time understanding how, for example, the pilot wave influences the trajectory of a photon in the double-slit experiment. Are we dealing with...

They make solenoid valves out of 300 series stainless steel with food-safe elastomers (probably safer than ordinary garden hose rubber) for soft drinks and pharmaceutical applications - this chart breaks down the options: http://www.asco.com/ASCO Asset...

This question is a little confusing. The Schwarzschild radius is actually very simple - it's just: And that just defines the event horizon. The equation you cited is called the Kretschmann scalar: K = Just to be clear, all non-rotating black hole singularities are considered to have zero...

I asked this question to a physics professor friend who got his PhD in magnetism, and he got back to me yesterday without an answer. So apparently I should’ve ranked this question at a higher level than “Intermediate.” Perhaps there’s an easier way to approach this. I keep thinking that it...

Yep, if an in-line option is out of the question then an external solenoid to crimp the hose would do the trick. Spring-actuated to squeeze it shut until the power is activated to release the pressure on the hose. But hoses don't like to be crimped back and forth like that. Sooner or later...

We’ve used magnetic solenoid valves on special fx projects, and they work great. The design is actually very clever, and super reliable. Have a look at the diagram and description in this Wikipedia page. What you have here is basically a “fluid transistor” – a ferromagnetic pin that’s...

Thank you jtbell, but I need to find a treatment specifically pertaining to rotating magnetic fields, because it's an exceptional case. For example, you might assume that you could just analyze the Poynting vector of the inductors in the array at various times in the cycle to get the...

It’s startling just how difficult it is to find an in-depth authoritative description of the physics of a rotating magnetic field online. You’d think an idea this old would be discussed comprehensively somewhere. I did find a huge and useful old book called “Magnetic Fields: A Comprehensive...

That's an excellent experiment. It looks much more energy efficient than an AC current through electromagnetic inductors. They both work on the same principle, the Lenz law, but with the rotating magnets in that Halbach array configuration (https://en.wikipedia.org/wiki/Halbach_array), you...

It seems to me that the best way to go about this kind of thing, would be a "track" made out of copper sheeting, and a board with high-frequency electromagnets underneath - alternating magnetic fields induce a magnetic repulsion in conductive metals. This would solve a couple of key problems...

But Richard Feynman seems to disagree: “A field just like that of a rotating magnet can be made with an arrangement of coils such as is shown in Fig. 16–13.” http://www.feynmanlectures.caltech.edu/II_16.html It’s my understanding that in all physical ways, including inductive effects, a...

Thanks for Poynting me in the right direction on this ; I found this excellent paper, which indicates that the Poynting vector in a transformer, which is exactly what we’re looking at in that Feynman diagram Fig.16-13, is directed from one coil through the center to the other (although in this...

Does a rotating magnetic field possesses angular momentum in the direction of rotation? I suppose this comes down to a broad question about the physical nature of fields in general. I love the Einstein-de Haas effect, where an iron core spins in the opposite direction of the induced spin...

For those who are interested in the theoretical physics of antigravity, here are some credible contemporary papers about a possible matter/antimatter antigravitational interaction, how this concept may explain “dark energy” and “dark matter,” and new “bi-metric” theories of general relativity...