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seen Mar 6 at 21:32

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 suggested edit on How does the voltage between two charged sheets change if change their distance
Feb
1
accepted Thermodynamics of a bar, specific heat
Feb
1
comment Thermodynamics of a bar, specific heat
Thank you very much, that was more than enough, I know how to get that Maxwell relation. You've already solved me a couple of headaches.
Feb
1
comment Thermodynamics of a bar, specific heat
@tpg2114 Yes, it was a typo
Feb
1
revised Thermodynamics of a bar, specific heat
typo
Feb
1
asked Thermodynamics of a bar, specific heat
Feb
1
comment How does the voltage between two charged sheets change if change their distance
@BenediktBauer You can't get a general formula in the case in which you can't ignore boundary effects. When you need values of field or voltage in complex cases like that one, you generally use numerical methods (computers) to get numerical values, but you can't get formulas. That's how pictures like the first one in my answer are done, by numerical approximations, that with computers can have huge preccisions.
Feb
1
answered How does the voltage between two charged sheets change if change their distance
Feb
1
accepted Irreversible process
Feb
1
comment Irreversible process
I'm sorry for the lack of information, the expansion is not free, it's a fast expansion to an external pressure of 1 bar, being the initial internal pressure 4 bars. Anyway, you helped and following "more or less" your same path I got the correct result. Thanks.
Jan
31
revised Irreversible process
added 230 characters in body
Jan
31
asked Irreversible process
Jan
30
comment Was the choice of red/green colors for traffic lights a happy coincidence?
I never learnt that in Secondary school...
Jan
28
comment Finding orbital eccentricity
Ok, good morning, great exam (not related to this), and I finally get the correct result, thanks for your help.
Jan
28
comment Why don't we use quater-circular dees instead of semi-circular dees in a Cyclotron
No idea, but I guess it's cheaper that way (2 oscilators, instead of 4), and you can still get high speeds.