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visits member for 2 years, 7 months
seen Aug 23 at 17:41

NTS


Feb
24
revised Time to emit electrons
deleted 1 characters in body
Feb
24
asked Time to emit electrons
Feb
19
comment Historic derivation of Wien's law
Thanks for your answer, although I was more interested in the historical derivation of the weak version of the function as I wrote it in the question. Just the way Wien derived it from maxwell's electromagnetism and classical thermodynamics.
Feb
19
comment Historic derivation of Wien's law
@joshphysics Thanks. That article was very interesting. I will try to find that article for free... maybe my university has some copies. Although that article is from year 97, will all sources say that relation was derived in his 93 paper: Eine neue Beziehung der Strahlung schwarzer Körper zum zweiten Hauptsatz der Wärmetheorie, which is also cited in that article, and that sadly it seems like it has no translated version.
Feb
18
accepted Hamilton's equations for a simple pendulum
Feb
18
accepted Magnetic force on capacitor
Feb
18
asked Historic derivation of Wien's law
Feb
12
awarded  Tumbleweed
Feb
6
comment Basic magnet through a copper coil experiment - What if poles were rotated 90 degress
@RodgersandHammertime I don't think that exists like a subject by itself. It's just analysing the system and trying to understand it by "seeing" the field lines and how the move over time. I don't think it's really complicated but the way I've learned it has been just by doing lots of problems.
Feb
5
comment Basic magnet through a copper coil experiment - What if poles were rotated 90 degress
In that post, the guy has edited it to say it's wrong. I think my answer is right, just by symmetry, actually, you have posted my answer there and they have told you it's right.
Feb
4
comment Entropy exchange of a free fall
Thanks, with this I "intuitively" saw the thing ""all the potential energy must become internal energy of the sand"". What my textbook wanted me to do is, as we're ignoring every drag or energy transferred to the ground, to consider all the potential energy as the heat transmited to the sand bag and just do $dS=dQ/T\Rightarrow \Delta S=mgh/T$ to calculate the entropy difference. I understand that this is no realistic at all.
Feb
4
accepted Entropy exchange of a free fall
Feb
4
revised Basic magnet through a copper coil experiment - What if poles were rotated 90 degress
added 2 characters in body
Feb
4
answered Basic magnet through a copper coil experiment - What if poles were rotated 90 degress
Feb
4
comment Entropy exchange of a free fall
I don't understand your last line (entropy change of the bag can never be neglected) I'm not doing that, I'm calculating it, I'm not supposing the entropy doesn't change because I'm calculating it. The problem explicitly says to suppose the temperature doesn't change from the impact, just to make calculations easier, what doesn't have anything to do with my doubt about the sign of the entropy, as supposing a change of the temperature to estimate that sign generates the same problem I'm in.
Feb
4
asked Entropy exchange of a free fall
Feb
4
comment Why Does Light Not Become Polarized In A Magnetic and/or Electric Field?
Just by superposition of waves: if you have an electric or magnetic field on a region of space and light goes through it, within that region the fields will sum to each other, and be the same as in the beginning when the leave that region.
Feb
2
revised How does the voltage between two charged sheets change if change their distance
Just a couple of epsilons so noone confuses them with E electric fields.
Feb
2
suggested approved edit on How does the voltage between two charged sheets change if change their distance
Feb
1
accepted Thermodynamics of a bar, specific heat