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visits member for 2 years, 10 months
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1d
comment Why can't we see light travelling from point A to B?
@duzzy that info is on the linked wikipedia page under "examples".
2d
awarded  Good Answer
2d
awarded  Mortarboard
2d
awarded  Nice Answer
2d
answered Why can't we see light travelling from point A to B?
Jul
18
comment How does a magnet cause magnetic force and its magnitude/direction?
youtube.com/watch?v=3D2RaDVkylY "When you ask a 'why', you have to be in some framework that you allow something to be true". That's FAR FROM the final say on this (which is why I'm not posting it as an answer), so don't let the video discourage you, but it's important to keep in mind.
Jul
10
revised Does space between objects contract?
edited body
Jul
1
revised How to emulate 40ft (12 m) of water?
Removed argument-causing bits from a good answer :)
Jun
25
comment A course in Lagrangian Mechanics
@KyleKanos I recommend the book, and he does stuff in there such as deriving [truly, not in a handwavy sense] the E.L. eqs from the least action principle (in the same way Euler did, it turns out), finding the rate of precession given angular momentum and an external torque, and plenty of other good math stuff. So it's far from popular. It does lack in problems a bit though.
Jun
25
reviewed Approve A magnet floating due to Meissner effect
Jun
25
reviewed Approve How to measure the wavelength of a laser pointer?
Jun
21
comment Calculating the resistance of a 3D shape between two points
"Derivation of the whole Drude model"?? There's no need to be so dramatic, it's maxwell+$J=\sigma E$!
Jun
20
comment Calculating the resistance of a 3D shape between two points
This is a pretty poor answer. It doesn't show how this follows from Maxwell's equations, which was part of the question.
Jun
17
answered Falling into the sun, a thought experiment for trying to understand reference frames
Jun
17
comment Derivation of law of inertia from Lagrangian method (Landau)
@AloizioMacedo turns out this is a very annoying question you asked! Let me know if my most recent edit "helps".
Jun
17
revised Derivation of law of inertia from Lagrangian method (Landau)
added 15 characters in body
Jun
17
revised Derivation of law of inertia from Lagrangian method (Landau)
added 15 characters in body
Jun
17
comment Derivation of law of inertia from Lagrangian method (Landau)
@AloizioMacedo Sorry, I was actually thinking about fixing that. The goal of classical mechanics is to uniquely determine the equations of motion. I'll update my post.
Jun
17
answered Derivation of law of inertia from Lagrangian method (Landau)
Jun
17
comment Derivation of law of inertia from Lagrangian method (Landau)
If $L=0\cdot \dot{x}^2$, $\dot{x}$ can be anything and satisfy $L=0$, and that's the issue the OP is getting at.