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Hello,


Apr
27
comment Is the second defined arbitrarily?
"So practically the second was historically defined so that 60•60•24•365.25 adds up to a year." - I don't think that part is right.
Jan
14
awarded  Autobiographer
Jan
7
comment Feynman diagrams in effective theories
Slightly related to that pion exchange is physics.stackexchange.com/q/9663/8851 Is it pions or gluons that mediate the strong force between nucleons?
Dec
29
comment Why toroid has no magnetic pole?
I think you mixed up the equation.
Dec
24
awarded  Popular Question
Dec
19
comment Gravity waves detectors; are they all similar?
I think you have a typo in the name of that project you linked to.
Nov
10
comment Effects of travel greater than speed of light
See also the recent question physics.stackexchange.com/q/143615/8851
Oct
29
comment Why are we not able to move at the speed of light again?
See also the Usenet Physics FAQ, question "Is Faster-Than-Light Travel or Communication Possible?" at math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html
Sep
30
comment How can we minimize the coefficient of static/kinetic friction?
Are you trying to reinvent the wheel?
Sep
30
comment Why can we cycle faster than we can run?
A typical biker rests on downhills, but I don't think a Tour de France biker ever does.
Sep
18
comment Why is the Earth's moon so big?
Is there something about this in the essay "The tragedy of the Moon" by Isaac Asimov? As far as I can remember, it's only about the consequences of a large moon, not about the causes.
Sep
18
comment Draw the charge configuration according to the electric field
@CuriousOne: do you mean to say that it's not realizable as an field with only static charges, because the field is not conservative, or equivalently, its integral on some closed paths isn't zero?
Jun
26
comment Understanding the “$\pi$” of a rotating disk
This entry of the usenet Physics FAQ is related to this question: math.ucr.edu/home/baez/physics/Relativity/SR/rigid_disk.html The Rigid Rotating Disk in Relativity
Mar
31
awarded  Yearling
Dec
7
comment How much lift does the average latex helium filled party balloon produce?
Don't you have to subtract the mass of the balloon skin itself?
Oct
16
comment can resistance be found without knowing length?
See the related question physics.stackexchange.com/q/80933 Resistances in a circular loop.
Sep
28
awarded  Informed
Jul
22
answered Numerical relativity coordinate system displayed
Jul
5
comment Cyclist's electrical tingling under power lines
@LubošMotl: if you want to decide whether to repeat the unpleasant experiment, consider xkcd.com/242 first.
Jun
13
comment How to cut a stone on on a White Dwarf
@Michael Brown: just ask on scifi.stackexchange.com