vela's latest activity
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vela reacted to jack action's post in the thread Problem about units conversion: cm^2 --> m^2 with
Like.
No, it is 0.01 m² = 100 cm². The exponent on the units is important: (0.1 m) X (0.1 m) = (0.1 X 0.1) (m X m) = 0.01 m.m = 0.01 m²; (10... -
That was one of the great Oscar travesties. Ordinary People over The Elephant Man and Raging Bull?! Best director and best picture?!
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https://www.aapt.org/Conferences/ lists the next set of conferences 2026 Winter Meeting - January 17 - 19, Las Vegas, Nevada 2026...
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vela replied to the thread Errors and significant figures.The idea behind error propagation is to calculate the uncertainty in the result. Once you know the uncertainty, it tells you where to...
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I suggest using the subjunctive here.
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vela replied to the thread Other Which branch of engineering is more physics heavy?.I think so too. There's some overlap, but there can still be a pretty big gap between the two majors. To properly prepare for physics...
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vela replied to the thread Site Usability nitpick -- Hyperlinks should be underlined.Is PF a link-heavy site? In my brief look at a number of sites the other day, I noticed most sites don't underline every link, but they...
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vela replied to the thread Site Usability nitpick -- Hyperlinks should be underlined.Kagi search results, on the other hand, do have underlined links. So do the sites for the New York Times, the LA Times, the Washington...
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vela reacted to robphy's post in the thread Site Usability nitpick -- Hyperlinks should be underlined with Like.
At the recent AAPT meeting, one of the updates to Glowscript/WebVPython is an improvement to better support accessibility. possibly...
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vela replied to the thread Need a book on Modern Physics to supplement Griffiths QM.Then I think it would help, as @robphy suggested above, if you could give us an example of a roadblock you're running into. Maybe you...
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vela replied to the thread Confusion In Writing Identical Particle Wavefunctions.It is. My point was that if same spin meant both spin-up or both spin-down, it would correspond to only two of the triplet states and...
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vela replied to the thread Confusion In Writing Identical Particle Wavefunctions.The same thought occurred to me; however, the solution explicitly lists all three of the triplet states and claims there's a threefold...
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vela replied to the thread Confusion In Writing Identical Particle Wavefunctions.I don't get it either. I think he's wrong, but the same text is in the second edition. I would think that an obvious error like that...
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vela reacted to DavidW's post in the thread Quantum Modern Quantum Mechanics 3rd Ed: J. J. Sakurai & Jim Napolitano Review with Like.
I'm studying Sakurai now to keep my mind busy during the summer. It is not an introductory book. He assumes you've already completed a...
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vela replied to the thread Insights Fixing Things Which Can Go Wrong With Complex Numbers.Isn't the complex logarithm traditionally denoted ##\log##, not ##\ln##? I noticed in a couple of places you used principle where you...
