Physics Forums: Science Discussion, Homework Help, Expert Commu… forum

I want to know what the data center craze is about. I was able to find only superficial discussions. Can anyone recommend a good online reference? In particular, it seems to me that sooner or later there will be a shakeout and the centers belonging to the losers will go bust. Second... Read more

Increasing the brightness of an OLED pixel (display in general), the 3 sub-pixels are added or multiplied? Is it R+x, G+x & B+x or R*x, G*x & B*x ? (Red Green Blue). Google Gemini answered it's multiplied, I want human confirmation...

Recently, I've gotten interested in applying Lagrangian mechanics to everything. I thought I would apply it to electrostatics. If I choose a Lagrangian of the form [tex]L=\int_{\Omega}\frac{\epsilon}{2}|\nabla V|^{2}+\rho VdA[/tex] For two different regions, the interfacial condition for the normal... Read more

I am frustrated with arXiv overload, more preciely, with daily following of new and replaced papers in gr-qc, hep-th and quant-ph. The problem is that the number of new and replaced papers each day is too big, much bigger than, say, ten years ago. It's hard to read carefully even all the titles... Read more

Hello, PF! I encountered with problem when I tried to understand following explanation about comparing the clocks. (See below) Given: We have two synchronized clocks at rest relative to each other, and one moving clock flying past them. Let us consider two reference frames: Earth... Read more

It's a basic fact that the harmonic series ##\displaystyle\sum_{n=1}^{\infty}\frac{1}{n}## diverges, while the similar series with alternating sign ##\displaystyle\sum_{n=1}^{\infty}\frac{(-1)^{n-1}}{n}## converges to the value ##\log 2##. If I compute partial sums for the series... Read more

Hi - can anyone help me identify what this apparatus is? A vacuum tube of some kind? What are the thin copper discs for? It seems to be missing some components - not sure. Does it hold any value or should I just dispose of it? John in Hope, Maine

The inner part of the core, about 0.4 to 0.6 M ⊙, is in sonic contact and collapses homologously, while the outer core collapses supersonically. Hi Could you explain the meaning of this sentence to me as simply as possible?

I finished - and printed - my collection of short stories! There Be Monsters A collection of fantastical maritime-themed short stories from past, present and future. by Dave Collins This is just the prototype run - want to get the art right, the typeface, margins... Read more

Hi all, I'm hoping this is the correct place to ask this kind of question. By way of context, I'm currently 38 and serving in the military, with a background in aviation including flight test. About 5 years ago I completed a full-time MSc in aerospace systems and I really enjoyed the experience... Read more

I have been thinking about a question: Could future technology allow us to test whether anything exists beyond the observable universe? I think that our inability to detect or test something today does not necessarily mean that it will always be impossible. Our current technology has limits... Read more

I have been thinking about a question: Could future technology allow us to test whether anything exists beyond the observable universe? I think that our inability to detect or test something today does not necessarily mean that it will always be impossible. Our current technology has limits... Read more