PAllen's latest activity
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PPAllen replied to the thread B Inflation after Atacama Cosmology Telescope Results.I would say no change to the status of any inflation aimed at ‘explaining’ the standard model initial state, since the conclusion is to...
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PProposition: the square root of a positive integer is either an integer or irrational (it cannot be a proper rational). Proof (by...
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PPAllen replied to the thread How do people explore new ideas in physics?.A little off topic, but since I alluded to Faraday's long apprenticeship with Sir Humphrey Davy that acted as bridge from self teaching...
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PPAllen replied to the thread How do people explore new ideas in physics?.Wrong. He did a long apprenticeship with Sir Humphrey Davy (president of the Royal Society, world famous chemist) before his work on EM...
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PPAllen replied to the thread Latex help page not rendering.The problem is (mostly?) fixed now. Just tested it.
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Phttps://en.wikipedia.org/wiki/Yvonne_Choquet-Bruhat (photo from 1974) https://www.nature.com/articles/d41586-025-01763-z...
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PPAllen replied to the thread I Physicists disagree wildly on what quantum mechanics says about real….I’d never seen that one. At first glance, I like it. Now, I have dig in to determine whether I can believe it …
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PRefer to the original diagram in post #1. Fact: The hanging mass on the left is and remains at rest. This means that the tension in the...
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PPAllen replied to the thread B Time dilation for two clocks at different altitudes on Earth.You, could, of course. I was trying to realize the notion of potential in contrast to surface gravity, as a function of position.
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PPAllen replied to the thread Insights Fixing Things Which Can Go Wrong With Complex Numbers.Thanks!
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PPAllen replied to the thread B Simple mass/scale puzzle.I gave you a single diagram showing that, including where there is 20 kg force.
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PPAllen replied to the thread B Simple mass/scale puzzle.Wait a minute - depends on whether the stationary car is able to roll, or how slippery the surface is. Extreme case: stationary car on...
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PPAllen replied to the thread B Simple mass/scale puzzle.Well if you look at the crude diagram I posted some poste ago, you will see what balances the 20 kg.
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PPAllen replied to the thread B Simple mass/scale puzzle.I don't know if this will help or not, and I don't have any drawing software, so here is a free hand diagram:
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PPAllen replied to the thread B Simple mass/scale puzzle.The advantages of the old fashioned agate knife edge balance with weights. Good to one milligram easily. Tarnish on the weights was the...
