meta user
network profile
| bio | website | |
|---|---|---|
| location | Maryland | |
| age | ||
| visits | member for | 9 months |
| seen | May 12 at 19:44 | |
| stats | profile views | 349 |
I enjoy studying physics as a hobby and think physics stack exchange is great!
Music Video of the moment. .Just a great song and video.
The Perfect Band. .Good use of stock footage
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Sep 28 |
revised |
Show that the Hamiltonian operator commutes with the angular momentum operator edited tags |
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Sep 28 |
asked | Eternal clocks and 4D spacetime crystals |
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Sep 28 |
asked | Physics of homebrewing heat exchangers |
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Sep 28 |
revised |
Why is the lightness of particles remarkable? deleted 11 characters in body |
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Sep 28 |
answered | Why is the lightness of particles remarkable? |
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Sep 27 |
answered | Energy is quantized |
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Sep 27 |
revised |
How did Einstein derive general relativity? deleted 5 characters in body |
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Sep 27 |
comment |
What is a good non-technical introduction to theories of everything? @Dilaton Probably true, I am just to the point where I think people need to be realistic in the level of effort they are going to have to invest in order to get a good understanding to discuss TOE's. Most popular discussions really barely touch on some of the more difficult concepts. Algebra is really not too difficult, its just that we don't introduce it early enough in the curriculum for people to make the mental connections. |
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Sep 27 |
revised |
What is a good non-technical introduction to theories of everything? edited body |
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Sep 27 |
answered | Tried to do the double slit experiment, failed. Why? |
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Sep 27 |
answered | What is a good non-technical introduction to theories of everything? |
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Sep 27 |
answered | How did Einstein derive general relativity? |
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Sep 27 |
comment |
The radius of the universe and time cont. As far as expanding into a space, this is not the conception that astronomers and cosmologists like. First, expansion implies a time derivative, which if you equate our notion of time into a spatial dimension for expansion, you would still need another variable of time, which is unphysical. GR assume a 4-d spacetime manifold, and the expansion parameter is the cosmological constant $\Lambda$ in the equation, $R_{ij} - \dfrac{1}{2} Rg_{ij} + \Lambda g_{ij} = \kappa T_{ij}$ |
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Sep 27 |
comment |
The radius of the universe and time @GaryBeilby From a metric perspective, there is a relationship between space and time. $ds^2 = dx^2 + dy^2 + dz^2 - c^2 dt^2$, where space is flat when $ds^2 = 0$. In that case we can write $c^2 dt^2 = dx^2 + dy^2 + dz^2$, which if we equate $dr^2 = dx^2 + dy^2 + dz^2$ we can write $c^2 dt^2 = dr^2$ and then $c^2 = \dfrac{dr^2}{dt^2}$, which shows that time and space share an inverse relationship. As such they are conjugate diameters of a hyperbola. In this sense there is a proper time that can be equated to a proper distance. to be cont. |
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Sep 26 |
awarded | Scholar |
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Sep 26 |
comment |
How is the singularity in Newtonian gravity resolved? Good points, and I will accept the answer, however Newton was smart enough to build the relationship between kinetic and potential energies and equate potential energy to gravitational force. So even if he didn't have a clear equivalence of mass to energy, he certainly had enough knowledge to parametrically manipulate the relationships. I just suspect that he was aware of some of these issues and was actually investigating them. |
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Sep 26 |
accepted | How is the singularity in Newtonian gravity resolved? |
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Sep 26 |
comment |
How is the singularity in Newtonian gravity resolved? Thanks, I would accept that except if Newtonian gravity admits infinite velocities, then it has to allow for infinite kinetic energy for an object, which would mean it has infinite energy density. |
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Sep 26 |
asked | How is the singularity in Newtonian gravity resolved? |
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Sep 25 |
revised |
How the bond angle of a water molecule is measured? deleted 3 characters in body |
