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seen Jan 21 at 22:38

I am watching you through me.


Jan
12
comment Why is there a magnetic field around a magnet if there are no charges moving?
Spin is not an effect. Spin is a major axiomatic basis (postulate) of QM. Same as a mass is an axiomatic basis in classical mechanics.
Jan
12
comment Why is there a magnetic field around a magnet if there are no charges moving?
Magnetic field is NOT just a fiction of relativity. It is installed in this universe by default. God perhaps could not create magnetic monopoles but he did create elementary magnetic dipoles. Same as electron is fundamental charge carrier he IS fundamental magnetic "charge" (dipole momentum) carrier.
Jan
12
comment Why is the harmonic oscillator so important?
Im sure there are many reasons, and one of them F=-k*x being the simplest possible force to govern oscillations.
Jan
11
comment Orbital mechanics problem
there are 2 "concentric" ellipses, lighter star orbits on a bigger ellipse and heavier star orbits a smaller one.
Jan
11
comment What trioboelectric materials create the best charge?
You can buy cheap teflon folio for the cooking. amazon.co.uk/Reusable-Teflon-Cooking-stick-guarantee/dp/… . Hope it helps.
Jan
11
comment Reason for motion after terminal velocity
Your logic is correct. But it does not stop because terminal velocity is not 0 ! So the medium could not bring the object to halt (like in the case of string), it could only bring it to "equilibrium". Imagine that the object will start stopping in midair, but then it will have no air resistance! :) And hence there will be no terminal velocity "effect" to compensate for the weight.
Jan
11
comment Asymmetry in magnetic field direction of an electric wire
Forget wire, use single electron moving in space. Do you think there is asymmetry in this case?
Jan
11
comment Elementary questions about where energy is stored in solids
@Hasan Just FYI there are no instantaneous processes in nature.
Dec
9
comment Einstein's space-time theory
The motivator was the mighty electrodynamics -- the mother of all in physics. Problem was that it was not invariant under Galilean transformations: en.wikipedia.org/wiki/Galilean_transformation. Turned out electrodynamics was more important than classical mechanics, that is why we have now not special electrodynamics but special mechanics, which is called special theory of relativity.
Dec
9
comment Origin of momentum. Noether's theorem
Important remark : translation is not origin - origin is INVARIANCE to something. And this something can be - translation, rotation, shifting in time, something else.
Nov
7
awarded  Nice Question
Sep
24
awarded  Autobiographer
Aug
2
comment Forces other than the fundamental interactions, e.g. friction
It is not silly question at all. Feynman was also thinking about exact same question -- how to get above formula for the friction from basic principles. Formula for friction is experimental.
May
28
comment Is Newton's third law always correct?
Your thinking is correct! (also first post add a correct point about the objects on which forces act) The amazing and subtle detail you missed is MASS. Every object as you described will have same forces acting on it but objects will have different masses -> so by the 2nd law they will move differently. The mass of the broken peace of wall was smaller than yours -> that's why you stayed there and the wall moved there :D Simple. That is why all Newton law's have to be always applied together. They form a coherent system.
May
1
comment Suggested reading for quantum field theory in curved spacetime
Are you going to learn for yourself or exam?
May
1
answered What can be measured or derived about a remote magnetic field?
May
1
comment What can be measured or derived about a remote magnetic field?
+1 to leverage haters. Very good question btw.
Apr
30
comment Lorentz invariance?
Rep farming is not Lorentz invariant :D
Apr
25
comment Alpha particle deflection by 180 degree in Rutherford's gold foil experiment
@biogirl What i mean is that there is no visible theoretical reason why this should not happen. No physical law forbids reflection on 180 degrees.
Apr
25
comment Alpha particle deflection by 180 degree in Rutherford's gold foil experiment
@biogirl Your thinking is correct. In fact it is rarely possible to prove something 100 percent. Especially in something to do with geometry. And your question is how do we know it is exactly 180??? We don't. We just extrapolate it from the fact that there are particles reflected on angles 170, 177 degrees and so on, Approaching 180 degrees as close as perfect you are with your experimentation. Another thing to help you understand this matter is that there is no IDEA which forbids this to happen.