TSny's latest activity

Using the wedge product (bi-vector) instead of the cross product (pseudo-vector) avoids the issues pseudo-vectors have under mirror...

I'm not familiar with any treatments of thermodynamics that prove differentiability of ##U##. I think physicists tend not to worry too...

Even though we need quantum mechanics to describe atoms, we still assume that systems of atoms have well-defined energies and that the...

I think Callen’s conclusion follows from his discussions earlier in Chapter 1. The change in the internal energy of a system during a...

I found a copy of the image at...

I was thumbing through the images in the wiki article, Types of periodic tables, and was amazed that there were over 2 dozen. Then I...

You can read a discription for the chart here. Click on the picture and zoom in.

Happy holidays folks. So I spent some time over the Thanksgiving holidays and developed a program that renders electric field lines of...

There are standard optical components used for generating lines from laser beams, known as Powell lenses. These lenses are manufactured...

I don't know. A highly reflective metal surface or mirror would not absorb very much. Each ray of light in the beam obeys the law of...

You might experiment with fanning out the beam by reflecting off a smooth cylindrical surface. Here, I used a ceramic mug.

The way I would look at it, he actually gets equation 1.13 from 1.14 (using Taylor expansions). I.e.: $$\kappa^{-1} \sin(\kappa s) =...

Thank you all for explanations. I tried to prove this to myself by contradiction, but it might be an oversimplification. If we assume...

Very good. I'm glad I could help.

You may have misunderstood what @TSny was asking, which was to write an expression for ##dt## in terms of ##dK##. And you have that, in...