Demystifier's latest activity
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Demystifier replied to the thread Undergrad Is Prof. Claus Kiefer's application of Gödel (+ infinity) justified?.Yes, the paper is very superficial, at several levels. First, even if the number of degrees of freedom is finite, one still needs... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.Yes, sorry for the misspelling! :doh:
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Demystifier replied to the thread Undergrad Relativistic Uniform Circular Motion.There is a simpler way to force the particles to move along a circle, just put the particle into a non-moving gutter (or tube) of a...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.One additional note. My model of the accelerometer with only one apparatus degree of freedom ##q_2## is analogous to the von Neumann...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.You are right, I should have been more precise about that. In a direct sense it determines ##\ddot{q}_2##. But indirectly it determines...
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Demystifier reacted to PeterDonis's post in the thread Undergrad Why is gravity a fictitious force? with
Like.
But it's not what your description said. You said: That says that the accelerometer is measuring the acceleration of particle 2. But... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.I don't see any problem with that. The second particle is a measuring "apparatus", which measures a property of the first particle. All...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.No, you misunderstood. I didn't say that the second particle is not affected by gravity. Instead, I considered several cases. In the...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.No it isn't. There is also the interaction with particle 1 due to the last term in the Lagrangian. That is exactly the reason why I...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.In order to better explain all this to myself (and hopefully to others as well), I will present a simple toy model. Consider two point...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.@Dale and @PeterDonis I'm still somewhat confused, so I will ask a slightly more general question. Consider a Newton-like theory of...
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Demystifier reacted to Dale's post in the thread Undergrad Why is gravity a fictitious force? with
Informative.
Yes, that is what I mean. I will point out that we are having this conversation in the Special and General Relativity subforum, so... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.I still disagree to some level. If we define force as mass times acceleration, the acceleration is always relative to a specified...
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.That works for a macroscopic body, but not for a microscopic particle.
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Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.How would you measure the electric force, without a reference to a frame? Note that the Coulomb theory of electric force is almost...