Nugatory's latest activity
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Nugatory reacted to Andy Resnick's post in the thread Graduate Position vs momentum measurement with
Like.
I guess it depends on what information you hope to obtain- a point detector does not cover all positions, but then your location... -
Nugatory replied to the thread Graduate Is photon frequency intrinsic or observer-dependent?.That's similar to saying that two bullets moving relative to one another will have different kinetic energies in different frames...
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Nugatory reacted to PeterDonis's post in the thread High School RocketGirl receives a radio message from Earth with Like.
Unfortunately, Brian Greene is notorious for only giving you part of the story. His pop science books and TV shows are even worse. I...
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Nugatory replied to the thread High School RocketGirl receives a radio message from Earth.She will only arrive at this incorrect result if she forgets to allow for the relativity of simultaneity, as you are in your...
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Nugatory replied to the thread High School RocketGirl receives a radio message from Earth.This may be the root of your misunderstanding -until you get over it relativity will continue to confuse you. It is equally valid to...
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Nugatory reacted to Lord Jestocost's post in the thread Undergrad Momentum measurement and uncertainty with Like.
First of all, one needs a meaningful, physical definition of the term “momentum of a confined quantum mechanical particle.”
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Nugatory reacted to PeterDonis's post in the thread High School RocketGirl receives a radio message from Earth with Like.
And that being so, I have removed that part of the thread title.
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Nugatory replied to the thread High School RocketGirl receives a radio message from Earth.And a comment about the thread title: this is not a twin paradox variation, the age difference seen in the twin paradox has nothing to...
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Nugatory replied to the thread High School RocketGirl receives a radio message from Earth.You have overlooked the relativity of simultaneity here. What did the ship clock read at the same time using the frame in which the...
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Nugatory reacted to sophiecentaur's post in the thread High School Why the bottom of a rolling wheel has zero velocity with Like.
This thread looks like a job for an appropriate Spirograph setup.
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Nugatory reacted to Ibix's post in the thread High School Why the bottom of a rolling wheel has zero velocity with Like.
A literal edge case.
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Nugatory replied to the thread High School Why the bottom of a rolling wheel has zero velocity.That one confused me for a moment, and then I realized why it had to be specifically a "train" wheel - the flange extends below the...
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Nugatory replied to the thread High School What if we could use a Black Hole as starship?.Depends on what you mean by “sure”? The best current theory we have is General Relativity, and it says that a black hole of mass M has...
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Nugatory reacted to wrobel's post in the thread Undergrad Is infinity a necessary concept? with Like.
We say that ##f(x)\to C## as ##x\to \infty## if for any positive number ##\varepsilon## there exists ##B## such that the inequality...
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Nugatory replied to the thread Graduate Time evolution of a detected particle.Not quite. We need to consider the resolution of our position-measuring apparatus. That resolution is not infinite, so the result of a...