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Apr
21
reviewed Approve Is force exerted by Earth different for different mass?
Apr
16
reviewed Approve Atmospheric pressure
Apr
16
answered Synchronization of clocks
Apr
16
reviewed Approve What is the utility of ADM decomposition of the space-time metric?
Apr
16
comment Is there any objective basis for the “south to north” directionality of magnetic fields?
No, nothing is (necessarily) moving along the magnetic field lines. But there is a westward net electric current in Earth's outer core that causes the magnetic fields and if it was in the opposite direction we would draw the field lines in the opposite direction. Of course, which current direction is paired with which magnetic field direction is an arbitrary convention, but so is the convention of which electron movement direction is paired with which current direction in your wire (i.e. "an abstract/logical construct").
Apr
15
comment Is there any objective basis for the “south to north” directionality of magnetic fields?
You seem to imply that the direction of electric current is not arbitrary since "the electrons are actually moving in one, specific direction" and the direction of the current is defined relative to that. In that case I would argue that the direction of the magnetic field is not arbitrary either since it is defined relative to the direction of electric current through Maxwell's equations.
Apr
14
answered Can video data can be transmitted via radio frequency?
Apr
14
revised Why is the speed of light being invariant and finite in all inertial reference frames?
deleted 1 character in body
Apr
14
comment Infinite acceleration of bob in pendulum with no friction or air resistance
Your description of the scenario is unclear in several ways. Maybe you could include a drawing and some formulas. Since you have come to the conclusion that the bob will accelerate infinitely, I assume that you have used a formula of some kind.
Apr
14
answered Why is the speed of light being invariant and finite in all inertial reference frames?
Feb
16
reviewed Approve Electric field integration?
Jan
29
awarded  Popular Question
Jan
11
awarded  Yearling
Dec
28
reviewed Approve What is an Unbalanced Interferometer
Nov
26
reviewed Approve Why are turns banked?
Oct
2
reviewed Reject Would a magnet attract a paperclip indefinitely?
Sep
30
comment Calibration of a clock
@Lenzuola The speed of light is an obscure number to most people. By that criteria only the seconds counting methods and similarly works. I get the impression that you are slowly changing the premise of the question to be about methods that would work with YOUR particular skills and knowledge. If you would have said so from the beginning I might not have bothered to answer.
Sep
30
comment Calibration of a clock
@Lenzuola The speed of sound in air have a negligible pressure dependence. Composition does matter, but it is hard to imagine a radically different composition that is both hospitable to humans and likely to form in another planet. If you have good pitch you can control for different composition by comparing the played frequency to your calculated.
Sep
30
comment Calibration of a clock
@Lenzuola I agree that most people don't know the Young's modulus of any metals, but surely there are some people who use this kind of information regularly who have memorized some values. The speed of sound in air, on the other hand is much more common knowledge. As I wrote: the best method will be different for different people depending on their skills and knowledge. Surely, most people wouldn't be able to build a radio from scratch either.
Sep
29
answered Calibration of a clock