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There is no problem with the approach you suggest: it's equivalent to deciding to use seconds and light-seconds as your units for space-time four vectors instead of light-meters and meters. (I actu...
In the context of quantum field theory, why is it impossible for two photons (or other massless bosons like gluons) to collide and produce a single photon? This kind of a process is supposed to be ...
Several questions have been posted recently where the user asking the question points to an extremely limited knowledge of the relevant field by asking of others to "explain like I'm five" (years o...
"Disorder" and "order" don't mean anything with regards to entropy. This is a common "science popularization" level description of entropy that is "not even wrong" in that, as you've seen, these te...
In special relativity, spacetime coordinates are normally given as $$(ct, x, y, z) \tag{S}$$ with the metric being either $$g = \operatorname{diag}(-1,1,1,1) \tag{+}$$ or $$g = \operatorname{d...
The major advantage of AC is that is can be easily transformed to different voltages. This is important because current transport is most efficient if the currents are low (because the losses are p...
I am having trouble understanding what a cosmic inflation is. Please try to suffice an explanation for non physicists / non formal students for physics / general audience. I understand that an ...
This is a small site with 5 questions in 30 days, rudeness is just going to drive people asking questions away. Casual users seeing newbies get insulted for not knowing things isn't going to make ...
What should our policy be toward rudeness? I don't think being blunt is a problem, but I do think that calling into question the OP's intelligence is a problem. For example, I don't think there's ...
As apparently seems par for this book, the theorem statement you're paraphrasing involves vaguely defined or completely undefined terms. For example, it talks about "admissible (smooth) paths" but ...
I have a question about the discussion of constrained Lagrangian systems in the book Mathematical Aspects of Classical and Celestial Mechanics by Arnold et al. (section 1.2.5). The Lagrangian syst...
Welcome to the Codidact site for Physics! We're glad you're here and we're excited to see what you will build. This community is starting "from scratch", without importing Q&A from other site...
I asked this question on Stack Exchange, and didn't get an answer, but maybe someone here will be able to help. In non-relativistic quantum mechanics, the normalization condition for position eige...
My opinion is that such qualifiers, especially when combined with very general questions about specialized subjects, are not helpful. Generally, the tone of the question will be indicative of the ...
Imagine two equivalent (e.g. same frequency) photons colliding with each other head-on. The linear momentum of the system is $0$ because each photon's momentum has the same magnitude but is pointin...
In short: Yes. And there are standard ways to distinguish variables from units. Let me explain in detail. In physics, we deal with physical properties of objects and systems. Those quantities can ...
There's not really a fundamental interpretation of the Lagrangian because the Lagrangian that describes the dynamics of a system isn't unique - more than one Lagrangian can yield the correct equati...
That sounds like something I'd say, so I'll explain this from my point of view, in particular regarding 'relativistic mass'. An 'outdated' theory or piece of terminology isn't typically mathematic...
You are somewhat misquoting what I said. It would help if you provide a link to the comments you are asking about, but the issue was most likely about lack of units on numeric values, not variable...
I am not sure if it is suitable in the site. I am asking the question here cause Olin and Celtschk said it here. They told me to use unit in every "single line" (Nope! They didn't say like it. Oli...
The Papers Category I don't think the "Papers" category would work well for physics. It would get a lot of spam, and I think it would be much more limited in usefulness than the one on Electrical ...
TL;DR Yes, that will work. It may not be practical, but that is a separate issue. There are two measurements routinely used for cooling in the US: BTU = British Thermal Unit = heat to raise the...
Moon colonies should be underground, but not for thermal management reasons. It's easy enough to regulate temperature closer to the surface. Indeed, the bigger problem will be getting rid of the wa...
Could be either [status-declined] or [status-bydesign], but this seems more of a request than a bug report, so I went with declined. This is how this one is supposed to work. A common and misguide...
I recommend https://www.mat.univie.ac.at/~neum/physfaq/topics/position.html which, while a bit hard to read, is more comprehensive and written by someone more authoritative than me. My research did...
