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age 21
visits member for 2 years, 10 months
seen 6 mins ago

Jun
16
comment Derivation of law of inertia from Lagrangian method (Landau)
$L=0$ doesn't imply $\dot{x}=0$. Actually, it implies absolutely nothing!
Jun
16
answered Why perpendicular vectors do not share components?
Jun
14
answered On the no-faster-than-light in special relativity
Jun
12
revised Wave number of $\mathbf{E}$ field
added 1 character in body
Jun
12
answered Wave number of $\mathbf{E}$ field
Jun
10
reviewed Approve Difference between angular frequency and angular velocity?
Jun
10
reviewed Approve Find time-parametrization given path and speed of a particle
Jun
5
awarded  Outspoken
Jun
3
comment How do I actually calculate the Lorentz transformation of a field strength tensor
Hi Josh, there's a mistake here! I think you're forgetting $f_{11}$ must be a matrix. The correct result is $\{\{\lambda f_{11}\lambda,\lambda f_{12}\},\{ f_{21}\lambda,f_{22} \} \}$
May
24
comment Best coordinate system for Projectile motion
@SohailAhmed I mean that the gravitational field is treated as a constant $g$, as opposed to a gravitational field which might go like $\frac{\hat{r}}{r^2}$. The second case is a lot more complicated.
May
24
answered Best coordinate system for Projectile motion
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?