PeroK's latest activity
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PeroK reacted to Herman Trivilino's post in the thread Undergrad The Einstein Clock aka Light Clock with
Sad.
What is the reason you are studying this paper? Are you trying to understand the physics? Or are you trying to understand the physics... -
PeroK reacted to Dale's post in the thread Undergrad The Einstein Clock aka Light Clock with
Informative.
Yes, there is a problem. The problem is here: That is false. The source of light is current and charge densities, as described by... -
PeroK reacted to PeterDonis's post in the thread Graduate Strong Progenitor Age Bias in Supernova Cosmology with
Wow.
The thread title is the first part of the title of a paper published just today [1]. Here is the abstract: [1]... -
PeroK replied to the thread Undergrad The Einstein Clock aka Light Clock.PS note that it is the speed of light that is independent of the motion of the source. Not the velocity of light, which is a vector and...
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PeroK replied to the thread Undergrad The Einstein Clock aka Light Clock.There is no problem. In the first case, all emissions were in the direction of relative motion of the reference frames. In the second...
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LLMs and AIs have a bad reputation at PF, and I share this opinion. I have seen too much nonsense they produced, and too many...
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PeroK replied to the thread Undergrad Conservation of angular momentum in the iceskater example.There are two aspects to this question. If we accept the conservation of AM (angular momentum), then it is a simple calculation. You...
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PeroK replied to the thread Undergrad Is calling fictitious forces "not real" just about terminology?.I accept the general point, but I don't accept that "inertial" or "pseudoforce" make things any clearer than "fictitious" or "illusory"...
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PeroK replied to the thread Undergrad Is calling fictitious forces "not real" just about terminology?.The problem exists for people who don't grasp the concept. Illusory forces would do just as well. Science is not about what words...
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PeroK reacted to Ibix's post in the thread Undergrad Is there anything inside a black hole? with
Like.
Just to add to existing answers, this is a (sadly) common misunderstanding. In relativity it turns out that there is considerable... -
PeroK replied to the thread Undergrad Is there anything inside a black hole?.There are already a lot of threads on this. The Schwarzschild black hole is an "eternal" black hole, which is a solution to the...
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It's not symerical, because the light source is at rest in one frame, but not the other. Motion relative to some random light source...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.The error was caused by an excess of positivity on the one hand and an excess of negativity on the other; and, a general lack of neutrality.
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PeroK replied to the thread Undergrad The Einstein Clock aka Light Clock.The light clock is really very simple. If you accept the invariance of the speed of light, then time dilation, length contraction and...
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PeroK reacted to DmitryS's post in the thread Undergrad The Einstein Clock aka Light Clock with Sad.
That's what I call a discussion. Right, I want to summarize now what I see, because I can't really reply to all the minor things that...