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Jul
30
revised Why is fundamental physics taught in terms of particles?
added 334 characters in body
Jul
30
revised Why is fundamental physics taught in terms of particles?
added 296 characters in body
Jul
30
answered Why is fundamental physics taught in terms of particles?
Jul
29
revised Why aren't units with powers, like cm³, surrounded by parentheses?
added 60 characters in body
Jul
29
revised Why aren't units with powers, like cm³, surrounded by parentheses?
added 1 character in body
Jul
14
revised BBC radiation: What is it?
deleted 8 characters in body
Jul
14
comment BBC radiation: What is it?
I'm not sure where 'XC' comes from. I merely suspect it is not an acronym, but rather derived from $x_\text{c}$, the sonic (or critical) point distance. I may be wrong about that.
Jul
14
answered BBC radiation: What is it?
Jul
9
comment Why do i see bright red hand when i place flashlight behind my hand?
Plus, the hand spectrum can found here: photobiology.info/PhotobioInArt.html.
Jul
7
comment Physical Role of Batter in Baseball
Here's some related reading: sie.arizona.edu/sysengr/publishedPapers/NewScientist.pdf and en.wikipedia.org/wiki/Coefficient_of_restitution.
Jul
6
comment How to convert physical ligth quantities (frequency, intencity, spectrum) to RGB and back?
See stackoverflow.com/q/1472514/2071794.
Jul
2
awarded  Curious
Jun
21
awarded  Notable Question
Jun
16
revised Why do all elements above $\require{mhchem}\ce{Fe}$ not decay to $\ce{Fe}$?
added 18 characters in body; edited title
Jun
12
comment does there exists a rope such that it takes longer to burn the whole rope from one end?
Something that has an internal structure like this perhaps: en.wikipedia.org/wiki/Chain_sinnet#mediaviewer/….
Jun
12
comment does there exists a rope such that it takes longer to burn the whole rope from one end?
I think that, besides the obvious stuff, there may be an answer that uses some kind of 'directional threading". That is, a way of weaving/braiding the rope that is asymmetrical in direction (but repeating).
Jun
10
revised Can photons have negative energy?
small stuff
Jun
10
comment Can photons have negative energy?
Related: physics.stackexchange.com/q/13654/17609 and physics.stackexchange.com/q/391/17609
Jun
10
comment Why does a large train cause the ground to shake?
Oh, I don't know. I guessed there was a cm or two between each segment to allow for expansion due to hot weather. And also because of the clear rhythm of the noise, which seems slower than the frequency of rotating wheels.
Jun
10
comment Why does a large train cause the ground to shake?
I'm missing the explicitly crossing between two segments, which seems (to me) the key thing that you feel when you are on a train yourself. Also, if the segments would be different-prime-number-lengthed, would the 'problem' be less? :) Or should you just make sure that segment lengths and car lengths don't match (up to some factor)? Like cars should be length 7 and track segments should be length 17.