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visits member for 2 years, 8 months
seen 2 hours ago

May
20
answered Determine resultant velocity of an elastic particle-particle collision in 3d space
May
19
comment About field gradient
Hi @victorbg, "gradient" can mean many different things. If someone is reading about a "gradient in the magnetic field", they probably mean "gradient" in the more general/english sense of the word, not the "turns a scalar field to a vector field" sense of the word. So, for example, if someone had an experiment with a "large magnetic field gradient", I would think something like the magnets involved in the Stern-Gerlach experiment en.wikipedia.org/wiki/Stern%E2%80%93Gerlach_experiment . Also relevant: en.wikipedia.org/wiki/…
May
18
comment Can Lagrangian mechanics be justified without referring to Newtonian mechanics?
It might also be worth mentioning what L&L do in the first book. IIRC they get pretty far just assuming the eqs of motion stem from an action principle & respect galilean invariance.
May
17
comment Relativistic rigid motion
@facenian It's true that you'd have to take care to avoid letting particles travel faster than the speed of light. Other than that, there is no contradiction.
May
16
answered Relativistic rigid motion
May
11
comment Took a picture of my laptop screen with my iPhone. The blue pattern in the image seems to magnetic lines. How is this possible?
Was your camera flash on? Also, can you check if the same pattern appears if you take a picture of a piece of paper or some low light/contrast thing?
May
11
reviewed Reject Tension on a string between two objects on a friction less surface
May
11
reviewed Approve Heat capacity of solids vs liquids $s_{liquid} = 2\ s_{solid}$
May
11
reviewed Approve Why does a double-slit experiment with sound waves never result in complete destructive interference?
May
7
comment Simultaneity and quantum indeterminism
Hi @MoziburUllah, in the terminology anyone is using if they say "relativity of simultaneity", events are defined to be simultaneous if events $(t_1,x_1,y_1,z_1)$ and $(t_2,x_2,y_2,z_2)$ have $t_1=t_2$, which is of course not a lorentz-invariant concept, hence "relativity of simultaneity".
May
6
comment Simultaneity and quantum indeterminism
@JohnDuffield All the articles I get are about the constancy of the speed of light? Yes, if you don't assume the length of a meter (SI convention) is constant, you run into all sorts of problems.
May
6
comment Simultaneity and quantum indeterminism
@Abc2000ro Exactly - because the notion of simultaneity of two spacelike separated events has no inherent physical meaning. The physical meaning comes about when you establish real, physical clocks, and then collect the data at some point.
May
6
answered Simultaneity and quantum indeterminism
May
5
reviewed Approve Has anyone ever tried to formulate physics based on computer science or information processing?
May
5
reviewed Reject Why don't I feel pressure on my body when swimming under water?
May
2
comment Do the same equations of motion imply the same Lagrangians?
I feel like this doesn't really answer the question. It gives a sufficient condition for generating the same equations of motion, but not (as AV23's answer shows) a necessary one.
May
1
awarded  Quorum
Apr
29
reviewed Approve What is the difference between angular speed and tangential speed in a circular motion?
Apr
26
reviewed Approve Why is the conductor an equipotential surface in electrostatics?
Apr
26
reviewed Approve Why do electric field lines start and end at 90 degree at the surface of a conductor?