Recent content by Bloo_Mec

Hi all! Problem: I am currently trying to calculate a Wiener filter for a stochastic system. The model is an ARX with determined parameters. Where I am: I have access to the transfer functions of the ARX model. I need to calculate the optimal causal filter: H(s)=1/Fi(s)*[Sx(s)/Fi(-s)]L...

Hi everyone, I have a problem with finding the transfer function of a linear system. It happens that in some terms the input and the output are multiplying and I have no idea how to do the Laplace transform of this. The system is a car and I am only studying its speed. The input is the...

I agree with Bobbywhy. In the mean time physicsforums is a great place to ask questions, I don't have a lot of experience in the forum, but from the little I have I can tell you that people here are great, they always want to help you. Ask people not to be too mathy and they won't be. You will...

Thank you Drakkith! I got it, it doesn't have to do with the smoothness of the surface, but with the opacity of the material.

I see! The difference is that a metal is opaque and white paint isn't! Thank you!

I see. Now you gave me another question, if liquids tend to have smooth surfaces, why doesn't a white liquid look like liquid mercury?

Yes but even when the silver is still liquid, we can start seeing the mirror effect. And I suppose that the silver will dry up in whatever shape the glass has, so this means that the glass surface needs to be perfectly smooth to make a mirror. And I also suppose that when I paint it white, the...

Thank you for the quick reply zhermes! I've just read that mirrors are made by "painting" glass with silver. Why does silver stay smooth when painted and white paint does not? It's the same polished glass surface. This questions are killing me! I love physics..

Thank you zhermes! So isn't it possible to smoth down a white surface to atomic level so that it becomes a mirror? What you said makes total sense, but has this been done to actually confirm this?

Hi, today a question crossed my mind. I was thinking about mirrors and colors, why they exist and how does light interact with them. And I always heard that white is the mix of all colors, and that white reflects all the colors. It makes sense because one points a red light to a white wall, the...

Homework Statement Consider 2 charges with value q=3[\muC], situated on the xOy plane at (0;2) and (0;-2) [cm]. Obtain the coordinates on the x-axis (y=0) where the modulo of the electrostatic field is maximum. Homework Equations The Attempt at a Solution I am trying to do this but...