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2d
answered The Twin Paradox using reference frame following the ship
Aug
25
comment How to Quantify the Relativity of Simultanuity
Well, Lorentz transformations and the mathematics of Special Relativity are precisely the way to quantify relativity of simultaneity and lots of other things. Do you know about those?
Aug
25
comment Why a type of motion is relative and another is not?
@dmckee: I've never heard anyone formulate that quantitatively. To me it sounds like it can't be done; one problem is that the gravitational effects of far away matter decrease with distance. Also frame dragging is extremely weak. It would be interesting to attempt a detailed calculation, though.
Aug
25
comment Why a type of motion is relative and another is not?
I'm sorry, I don't understand what you're saying. The CMB is not special. For example, if you know what the Sun's spectrum looks like in the Sun's rest frame, if later you want to know your velocity you can measure the Sun's Doppler shift to figure out your velocity with respect to the Sun. This doesn't contradict relativity. And I think your last paragraph could use a little humility; Einstein might not have known about the CMB, but every physicist for the last 50 years has, and relativity hasn't gone anywhere.
Aug
24
answered Why a type of motion is relative and another is not?
Aug
24
comment Why a type of motion is relative and another is not?
The principle of relativity doesn't say that two observers can't measure their relative motions. It says that if you're in uniform motion, you (a single observer) can't measure your velocity without looking outside your lab. In this case, measuring the CMB counts as looking outside. You would just be measuring your velocity with respect to the CMB.
Aug
24
comment Why teachers use red ink for checking, why are traffic signals show red for stop?
Even if, as you say, it had to do with memory, this wouldn't be a physics question. Teachers use red ink because students don't.
Aug
23
answered Independent Variables of a Lagrangian
Aug
23
comment Electromagnetic Interaction
ACuriousMind is right; this is in fact a very difficult question to answer, and people have to study a lot to even come close to understanding the answer (or never understanding it, if you ask Feynman). But I would suggest that you stop thinking in terms of exchange of particles. The "virtual" photons are best understood as forming a quantum field, not too different in some aspects (extremely different in others) from a classical electromagnetic field.
Aug
23
comment Fundamental paradox with Newton's Law of Gravity?
Your question is fine, but you might want to take something into account. What is more likely, that there's a paradox that no one has solved in the last 350 years, or that you simply misunderstood something?
Aug
22
reviewed Approve Are there any inventions/applications in our world based on QFT?
Aug
22
revised Is it possible to figure out the centripetal acceleration?
edited body; edited title
Aug
22
comment Proof for parallelogram law of vector addition
Vectors are a purely mathematical construct. You seem to be asking about the superposition principle, which is the physical fact that forces add like vectors. Don't get it backwards! You seem to be implying that vectors add like they do because of the superposition principle, but it's the other way around: we represent forces with vectors because addition of forces is just like addition of vectors. In any case, I think you should make your question clearer, because apparently no one understood what you were asking.
Aug
22
comment Proof for parallelogram law of vector addition
Two things. One, this is a mathematical question, so experimental evidence is not really a proof. Second, how do you define vector addition?
Aug
21
comment Why should an electron orbit decay?
Techincally, in classical electrodynamics charged particles radiate waves, not photons.
Aug
19
comment Help with relativity simultaneity paradox
The question as it stands is hard to understand. You should probably be a bit clearer in your last paragraph. Including some equations to illustrate what you're talking about would probably help.
Aug
18
comment Predicting path of light?(general relativity and electromagnetism)
Let me ask you a leading question. Suppose you have an electron moving at non relativistic speeds under the influence of a given electric field and of gravity. Do you need to unify EM and gravity to predict its movement?
Aug
17
comment Physical meaning of wavelength of an EM wave
Photons are a very tricky thing to think about. While a single photon can have a well defined wavelength, it is not really equivalent to a classical wave with that wavelength.
Aug
16
comment Why is the $dx$ right next to the integral sign in QFT literature?
@doetoe: In physics the $dx$ is essential, because it carries units.
Aug
15
comment What happens when breaking simultaneity leads to different outcomes?
The explosion occurs when the devices are hit simultaneously from what frame of reference? That is the key question.