UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<egg|anbo|egg>
augh saturn is getting treed
<egg|anbo|egg>
hm I got lost
<raptop>
Try backtracking to Albuquerque, and turning the other way?
<egg|anbo|egg>
I keep getting lost trying to star hop to the saturn nebula s going to look elsewhere
<egg|anbo|egg>
randomly clicked somewhere and Stellarium shows me PRN E19
<egg|anbo|egg>
not going to image that one
* egg|anbo|egg
googles M 29 cluster
<egg|anbo|egg>
second result : M29 cluster bomb
<raptop>
smol open cluster in cygnus
<raptop>
Uh, for wikipedia porpoises, I always put in "messier $number" instead of "M $number"
<egg|anbo|egg>
raptop: clever
<raptop>
I mean, you're always going to get a bunch of ARs instead of the Eagle Nebula...
<raptop>
!wpn
* galois
gives raptop a mecha ultrarelativistic accident with a tablet attachment
* raptop
isn't sure what just happened, but I'm going to blame Heather Flowers
<egg|anbo|egg>
raptop: currently have a bit of M31 in field
<egg|anbo|egg>
unsure whether I should try to find M110 from there
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<raptop>
hrm, maybej
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<raptop>
Incidentally, Andromeda has a number of globular clusters...
<galois>
[WIKIPEDIA] Mayall II | "Mayall II, also known as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1, M31GC J003247+393440 or Andromeda's Cluster, is a globular cluster orbiting M31, the Andromeda Galaxy.It is located 130,000 light-years (40 kpc) from the Andromeda Galaxy's galactic core, and is the brightest (by absolute magnitude..."
<raptop>
SMG?
<egg|anbo|egg>
raptop: M110 in frame I believe
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<egg|anbo|egg>
uh oh
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<raptop>
!acr -add:SMG SubMillimeter Galaxy (A galaxy, often at high z, with large emission in the submillimeter range. Typcial indicative of very high star formation rates)
<galois>
Definition added!
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* egg|zzz|egg
pokes raptop with M110
<raptop>
Please do not shoot my internet connection
<raptop>
!8 should I run GALFIT on that image of M110?
<galois>
raptop: no
* raptop
pokes raptop in the mental health
<SnoopJeDi>
!wpn raptop
* galois
gives raptop a fibre
<SnoopJeDi>
!8 is it dietary fibre
<galois>
SnoopJeDi: no
<SnoopJeDi>
!why not
<galois>
SnoopJeDi: because reasons
<SnoopJeDi>
!wpn -add:adj dietary
<galois>
Added adj 'dietary'
<raptop>
!8 is it an optical fibre?
<galois>
raptop: no
<raptop>
blink
<raptop>
!wpn SnoopJeDi
* galois
gives SnoopJeDi an optimized ITAR compliant heap
<raptop>
ITAR compliant data structures
<SnoopJeDi>
hack the planet
<SnoopJeDi>
what's shaking tonight raptop, you okay?
<SnoopJeDi>
oh I hadn't thought about them being concentric
<egg|zzz|egg>
the non-concentric case reduces to two point charges, right?
<SnoopJeDi>
should-do yea
<egg|zzz|egg>
UmbralRaptop: not sure what you are trying to say with this first sentence
<raptop>
egg|zzz|egg: trying to think about what the form of the solution would be
<egg|zzz|egg>
the inner sphære is a point charge, and so you have a point charge inside a charged sphere (not necessarily at the centre, nobody tells you such a thing) such that the potential difference between the two is that of the battery
<raptop>
something like V(r,θ) = 1/(4πε_0) * (q/r + p*cos(θ)/r^2)
<egg|zzz|egg>
no you are trying to do geometry to a thing that is massively underspecified
<raptop>
Yes, and the graders dislike partial credit, so I figure out how to get a solution anyway, or need to be almost perfect on the other problems
<egg|zzz|egg>
you need to figure out how to approach this kind of problem though, because if you don’t solve them you don’t have a solution
<SnoopJeDi>
agreed, it's hard to read too much into "two isolated spheres" so I suspect this has a straight-forward angle of attack, probably of the form \int{dE}, although I confess I can't immediately construct it in my head
<egg|zzz|egg>
it was very much looking like you were heading towards the wrong problem
<egg|zzz|egg>
but that was because you were
<egg|zzz|egg>
raptop: what does your book
<egg|zzz|egg>
raptop: what does your book/your brain know about Green's reciprocation theorem
<raptop>
egg|zzz|egg: the book is Jackson, so...
<SnoopJeDi>
oh heh
<SnoopJeDi>
makes sense that we were confused then
<egg|zzz|egg>
I didn't know about it but since it is a hint I assume you do, and cursorily googling it finds examples that are furiously similar
<egg|zzz|egg>
correction, I literally find this problem
* egg|zzz|egg
proceeds to not read the solution
* raptop
was mostly finding unrelated proof's of green's reciprocity theorem
<egg|zzz|egg>
raptop: anyway, what does Jackson have to say about Green's reciprocation theorem
<SnoopJeDi>
mentioned only in problem 1.11 in my (2nd?) edition
<SnoopJeDi>
oh hrm no it's a first edition evidently
<egg|anbo|egg>
(or what did the lectures have to say about it)
<egg|anbo|egg>
cat is purring
<SnoopJeDi>
!wpn cat
* galois
gives cat an enterprise undulator
<raptop>
egg|zzz|egg: no lectures really, it was a flipped classroom (in, uh, spring 2018?)
* egg|anbo|egg
pets the cat, thereby imbuing it with a charge Q
<SnoopJeDi>
hmm, I would've thought that'd give it a charged μ
<egg|anbo|egg>
!choose bring the scope inside|what is sleep
<galois>
egg|anbo|egg: Your options: bring the scope inside, what is sleep. My choice: what is sleep
<egg|anbo|egg>
;choose bring the scope inside|what is sleep
<raptop>
hehe, kitty go brrr
<kmath>
egg|anbo|egg: what is sleep
<raptop>
brrr, prrr, close enough
<raptop>
SnoopJeDi: in my 3rd edition: there's 1.12 (prove the theorem), 1.13 (vaguely similiar but between 2 infinite parallel plates), and 1.14 which is something different and another proof
<SnoopJeDi>
your 1.12 is probably what I have in mine then
<SnoopJeDi>
it could be that I have your 1.14 too I didn't really read the problem set, just a quick glance :)
<egg|anbo|egg>
raptop: OK so 1.13 is likely what you want to go off of
<egg|anbo|egg>
to understand how this theorem is applied
<egg|anbo|egg>
I suppose this is 1.13 file:///C:/Users/robin/Downloads/Jackson_1_13_Homework_Solution.pdf
<egg|anbo|egg>
> To take advantage of this theorem, we take the real problem as one of the problems, and then we can choose whatever problem we want as the second problem as long as it has the same bounding surface of two conducting planes.
* raptop
stares at Griffiths problem 3.44 (second edition)
<raptop>
(part a is the parallel plates, part b is the spheres)
<egg|anbo|egg>
yeah this question is lifted from Griffiths
<egg|anbo|egg>
no matter
<egg|anbo|egg>
you should solve it
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<egg|anbo|egg>
;choose there are clouds|high-altitude clouds arent real,
<kmath>
egg|anbo|egg: there are clouds
<egg|anbo|egg>
!choose there are clouds|high-altitude clouds arent real,
<galois>
egg|anbo|egg: Your options: there are clouds, "high-altitude clouds arent real,". My choice: there are clouds
<egg|anbo|egg>
I see through them though,
* egg|anbo|egg
tries looking for M 31 through a tree
<egg|anbo|egg>
it is a very tall ash tree
<egg|anbo|egg>
if M 31 is in a large ash tree, is that Yggdrasil
<raptop>
yes, and you should check for sneks
<_whitenotifier-d13c>
[Principia] pleroy opened pull request #2610: The vector space of Poisson series - https://git.io/JfpYC
<_whitenotifier-d13c>
[Principia] pleroy edited pull request #2610: The vector space of Poisson series - https://git.io/JfpYC