Recent content by lpfr

I know two others. The fist one, even from the historical point of view, into use a prism, and the dispersive power of glass. There have been lots of different designs with prisms. But the resolving power is low. That is, it is hard to separate very near wavelengths. Grating spectroscopes have a...

As far as I know, Newton only worked with inertial frames and, of course he did not use the terms inertial or non inertial. I'm not 100% sure, but I think that non inertial frames are a much more recent invention. Maybe as recent as 19th century. As Newton did not consider and ignored the...

<< insulting comments edited out by berkeman >> First: the idea is to find a simpler reasoning for this problem and not another one. Second: replacing everyday water with a fluid that very few have ever seen and less still have had the possibility to play with, is not a simplification. I...

This thread is NOT concerned with interferometers and still less with the Mach-Zehnder interferometer. I did have a look to the only of the Cthugha's links on the web. Have you read it? I doubt. It has no more to do with this thread than the Mach-Zehnder interferometer.

I do not think that it matters. What Peter57 want is understand how the things happen. I hope that what I explained to him will help. I'm sure that, once he has understood what happen if he releases the string completely and then immobilize it when the object has attaint the 2R, he will have...

Yes, dialectics consume power, much more than dielectrics. I think that you have not understood what is the fun with "perpetumm mobile". It is not to say "it won't work". Of course we all know that it won't work. The fun is to demonstrate, without using the conservation of energy, that it is...

I'm sorry, but you simply cannot write equations and solve them. This is a problem of hydrodynamics in turbulent flow with almost no symmetry. It is almost "as simple" as to compute the lift of the shuttle. The only thing you can say are generalities about lift and drag. In practice water-skis...

"Dampening" has already a meaning in physics and in life. If you call "dampening" an opposing, compensating, resisting, etc, but conservative, force, you must not be surprised that people misunderstand you.

It is the first time that I see a perpetuum mobile which uses electrical properties. I like it! The part of water that is "sucked" by the condenser is at a pressure smaller than the atmospheric pressure. The line of hydrostatic pressure equal to the atmospheric pressure is at the level of the...

There is the optical path for constructive multiple reflections and the phase lag of the transmitted beam due to the thickness of the layer and a variable parameter: the refraction index of the layer. I have not made a program to calculate this, so I'm not sure if you can satisfy the two...

I do not know what you understand by "perfect conductors". Anyhow, if you have a conductor without ohmmic losses, but with few free electrons, the wave created by the oscillating electrons will not have the amplitude needed to "reflect" totally the incoming wave. But even in this case, the phase...

Make a drawing as the one I gave. Release the string. The object continues in a tangential straight trajectory. Wait until its distance to the center is 2R. Look at the speed: decompose it in a component parallel to the circle of radius 2R and a radial component. Hold again the string. The...

Maybe I misunderstood something in this post: It seems contradict your previous post with which I totally agree. there is some component of the radial force that is in the direction of motion of the object,.. seemed to agree partially with post #9. If this was not the case, all the better...

What a think is that the power is "pushed" along the diagonal by the incoming beams. It is not really guided as in a waveguide. At the edges of the beams the light exits. If the beams cover al the BS, the power will exit at the edge of the cube. I never said that power was lost or absorbed in...

Constructive interference between multiple reflections asks for the good thickness of the layer. But the path difference is a function of the angle \theta_t and there is very small chances for it to be a rational factor of lambda (you must make the drawing to see this). Even if you must add a...