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| bio | website | arcsecond.wordpress.com |
|---|---|---|
| location | Baltimore, MD | |
| age | 28 | |
| visits | member for | 2 years, 6 months |
| seen | 15 mins ago | |
| stats | profile views | 2,722 |
I'm a physics graduate student.
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Mar 7 |
comment |
Liouville's theorem and gravitationally deflected lightpaths The second-law argument does work. For example if there is less light from the mirror behind the black body, just paint the back of it perfect white. Re: Liouville's theorem in geometric optics; I might have some time for that later on but I can't just do it in a couple minutes off the top of my head like this above argument. |
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Mar 7 |
answered | Liouville's theorem and gravitationally deflected lightpaths |
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Mar 5 |
revised |
Motion of a pendulum added 34 characters in body |
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Mar 5 |
answered | Motion of a pendulum |
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Mar 5 |
revised |
What is the optimal weight for a golf ball? added 50 characters in body |
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Mar 5 |
comment |
What is the optimal weight for a golf ball? Thanks, Gugg. That does suggest there's a factor of a few error in here, probably because of the good aerodynamics (I left out a drag coefficient, for example). |
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Mar 5 |
revised |
What is the optimal weight for a golf ball? deleted 1 characters in body |
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Mar 5 |
answered | What is the optimal weight for a golf ball? |
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Mar 5 |
revised |
What is the optimal weight for a golf ball? edited title |
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Mar 3 |
comment |
Evaluate Commutator with Partial Derivatives $A$, $B$, and $C$ in these identities represent arbitrary operators, so they can be $x$ or $\frac{\partial }{\partial x}$, for example. |
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Mar 3 |
answered | Evaluate Commutator with Partial Derivatives |
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Mar 2 |
revised |
Estimate number of hairs on human head edited tags |
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Mar 1 |
comment |
Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian There's a full proof here en.wikipedia.org/wiki/… Your are right that the fourier transform of a gaussian is a gaussian with standard deviation inversely proportional to the original. |
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Feb 28 |
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Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian I used $\psi$ because that is standard notation for a wavefunction |
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Feb 28 |
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Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian It is a bit long to explain in detail; your quantum mechanics textbook should explain it, though. I added a little detail on how to do this with a wavefunction. The answer to your question is essentially that the things you were call $\Delta x$ is not the $\Delta x$ in the uncertainty relationship. |
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Feb 28 |
revised |
Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian added 150 characters in body |
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Feb 28 |
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Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian I am using bra-ket notation. en.wikipedia.org/wiki/Bra%E2%80%93ket_notation |
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Feb 28 |
revised |
Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian deleted 83 characters in body |
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Feb 28 |
answered | Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian |
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Feb 28 |
answered | Static Friction in Free Body Diagram (FBD) of Car parked on Incline |
