PeroK's latest activity
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PeroK replied to the thread I Confused about time dilation -- motion vs energy.The energy and momentum of a clock depend on its mass. The measured time dilation does not. -
PeroK replied to the thread B Onto set mapping is the surjective set mapping, and into injective?.Whether you use into and/or onto is upto you!
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PeroK reacted to Gavran's post in the thread B Onto set mapping is the surjective set mapping, and into injective? with
Like.
To be on the set means occupying the whole set in a particular way and the word “onto” follows the definition of a surjective function... -
PeroK reacted to berkeman's post in the thread EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity) with Like.
Those are very tiny signals, and not likely to cause any physical effects. Folks here at PF have lots of experience with EM shielding...
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PeroK reacted to Baluncore's post in the thread EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity) with Like.
Welcome to PF. The observations you report are inconsistent with what we know about the physical world. While it is possible to screen...
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PeroK replied to the thread Introductions.I thought that sounded familiar: https://m.imdb.com/title/tt0067355/
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PeroK reacted to PeterDonis's post in the thread A Gravitational Analysis of Wide Binaries with Like.
I don't think that's a fair description of the paper you referenced. For example, consider these items from the abstract: "[W]e are...
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PeroK reacted to ojitojuntos's post in the thread I Question about discussions around quantum interpretations with Like.
I understand that the world of interpretations of quantum mechanics is very complex, as experimental data hasn't completely falsified...
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PeroK replied to the thread A How does time derivative commute from one variable to another?.That's the hand-waving way to do it. If you want to justify it more formally, then you need a sound mathematical basis for what is a...
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PeroK replied to the thread A How does time derivative commute from one variable to another?.The definition of a differential that I use is: If ##x = f(t)## then ##dx = f'(t)dt##, where ##f'(t) = \frac{df}{dt}##. So, as ##\dot...
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PeroK replied to the thread I Quantum behaviour of an electron around a positively charged sphere.I'm not sure what you mean by really occurs. The hydrogen atom satisfies the relevant Schrodinger equation. That gives a sequence of...
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PeroK replied to the thread I Quantum behaviour of an electron around a positively charged sphere.No, it doesn't. QM applies for a hydrogen atom. And classical electromagnetism does not apply.
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Wrong. For someone falling into the black hole, time passes normally. Their clocks read one second per second, just as ours do. We see...
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That is only a small part of the trick, not even close to the whole trick. Other parts of the trick include 1) we can use any...
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PeroK reacted to weirdoguy's post in the thread I Quantum behaviour of an electron around a positively charged sphere with Like.
Why? Positively charged sphere is something way different than proton. Real world sphere would consist of milions of atoms itself!