egg|nomz|egg 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.
<kmath> <FioraAeterna> it's an anti-seizure med! it's a mood stabilizer! it aborts migraines!
<kmath> <bofh453> OH: "депакотя"
<UmbralRaptor> ?
<egg> UmbralRaptor: Fiora's tweet is about valproate
<UmbralRaptor> depakotya sounds like a cross between a drug and a cat.
<UmbralRaptor> (unfortunately kittens are not very effective mood stabilizers)
<egg> well yes, I think that's the pun
<egg> also iirc valproate works on cats right
<egg> (but котя doesn't take depakine apparently)
<UmbralRaptor> I_zz = 3M(R^2/10 + h^2/5)?
<UmbralRaptor> … nope
<egg> UmbralRaptor: first term looks right, second shouldn't be here?
<UmbralRaptor> stabbity
<egg> UmbralRaptor: i=j=3, you're integrating r^2+x3^2 - x3x3 right?
<egg> UmbralRaptor: so sum of ρ r^3 dφ dr dx3
* UmbralRaptor is attempting cylindrical coordinates?
<egg> well that's what I'm doing too
<UmbralRaptor> And yeah, I forgot a subtraction before integrating. >_<
<egg> UmbralRaptor: okay so it's all good then, that kills your second term hopefully, and you're left with the first one which is correct
* UmbralRaptor stings the first term with a venomous triangle.
<egg> UmbralRaptor: so all the off-diagonal terms should still vanish right
<egg> UmbralRaptor: because of the sting or costing of death integrated over the circle
<egg> UmbralRaptor: so by symmetry you just have another integral to do
<UmbralRaptor> dV = r dr dθ dz >_>;;
<egg> yes
<egg> UmbralRaptor: so?
<egg> UmbralRaptor: so you get 3M/20 (4 h^2 + R^2) in x1 and x2 afaict
<egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a titanium tomahawk
ferram4 has quit [Read error: Connection reset by peer]
<UmbralRaptor> Yay, it works.
ferram4 has joined #kspacademia
<egg> UmbralRaptor: you see why the other entries are 0 right?
<UmbralRaptor> not uet
<UmbralRaptor> yet
<egg> UmbralRaptor: so the delta is 0, so you have x1x2 or x1x3 (or x2x3 but same because symmetry)
<egg> UmbralRaptor: reorder the integrals to integrate over the angle first
<egg> UmbralRaptor: factor crap out of that inner integral, you are integrating cos * sin, cos, or sin respectively over the whole circle
<egg> UmbralRaptor: thus you're left with the sum of 0*crap dr dz
icefire has quit [Read error: -0x1: UNKNOWN ERROR CODE (0001)]
<UmbralRaptor> bleah, need to redo the setup
<egg> ?
<UmbralRaptor> cylinders are not my friends https://photos.app.goo.gl/HgDil8tHYysMjXV12
Technicalfool has quit [Ping timeout: 200 seconds]
ferram4 has quit [Read error: Connection reset by peer]
ferram4_ has joined #kspacademia
<egg> UmbralRaptor: uh what is I_RZ supposed to mean
<egg> UmbralRaptor: I was talking about computing I_11 through I_33 with the given axes for x1 through x3, just *doing the integration* in cylindrical coords
<UmbralRaptor> ah
<egg> UmbralRaptor: like, moments of inertia along an axis tend to require an axis, so I'm not sure what I_RR is supposed to mean
<egg> there's no R axis
<egg> UmbralRaptor: so, like, <egg> UmbralRaptor: well then shrug, x1 = r cos φ, x2 = r sin φ, dV = r dφ dr dx3, sum for x3 ranging from 0 to h, for r ranging from 0 to R x3/h, for θ ranging from 0 to 2π of what you said
<egg> UmbralRaptor: just use your formula for I_ij (just don't do an integration in cartesian coords over a cone because that sounds unpleasant)
<egg> UmbralRaptor: and reorder your integrals to integrate over the angle first
<egg> UmbralRaptor: you should immediately see that the off-diagonal entries vanish
<egg> UmbralRaptor: do you see what I mean
<UmbralRaptor> okay, I can see I_xy = 0, but I have an error somewhere in I_xx
<egg> UmbralRaptor: so the integrand is (r^2+x3^2-x1^2)r, right? (where the outer r is from the volume element)
<egg> (and there's the density but let's just factor that one out or set it to 1 or something)
<UmbralRaptor> yeah
<soundnfury> egg: just use naturalised units ;)
<soundnfury> (that's how those work, right?)
<UmbralRaptor> I set up the integrand wrong.
* UmbralRaptor gives soundnfury an unnatural unit system. (probably designed by goblins)
<soundnfury> thanks, I _love_ British Imperial units :)
<egg> iirc those goblinoid units were rather weirder
<egg> there was a two-ell telescope
* UmbralRaptor heats soundnfury with a Baker's dozen of international British thermal units.
* soundnfury recalls the time a rocket scientist measured s.h.c. in BTUs per lb Rankine
e_14159 has quit [Ping timeout: 186 seconds]
<soundnfury> egg: A law of King Edward I required that every town in England had an ellwand. (Source: wiki)
<egg> UmbralRaptor: are there lines
<egg> in the unnatural units
<UmbralRaptor> Yes, but if they're 1/10 of an inch, it's probably not an avoirdupois inch.
e_14159 has joined #kspacademia
* egg staring at the kspd&d backlog
* UmbralRaptor does not give egg a three line rifle.
<soundnfury> … is that where three-line whip comes from?
<UmbralRaptor> ?
<soundnfury> … according to wiki, no. It refers to the number of times the !instructions are underlined.
<egg> UmbralRaptor: ah yes there were bennettitalean seeds as units in that kspd&d thing
<egg> UmbralRaptor: <egg|zzz|egg> the hadrosaur is tired and decides to sleep despite being glowy
egg is now known as egg|zzz|egg
<egg|zzz|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor an ultramatic planet
<UmbralRaptor> uh
<soundnfury> !wpn egg|zzz|egg
* Qboid gives egg|zzz|egg an unitary reflector
hattivat has quit [Quit: Goodnight!]
<egg|zzz|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a [DATA EXPUNGED] neutron diagram which strongly resembles a group
<UmbralRaptor> x_x
<UmbralRaptor> >_<
* egg|zzz|egg pets UmbralRaptor
* UmbralRaptor doesn't see a way to complete this homework.
<egg|zzz|egg> what, the cone?
<egg|zzz|egg> UmbralRaptor: don't you have the entire matrix?
<egg|zzz|egg> and then just parallel-axis it to the centre of mass
<egg|phone|egg> Z
* UmbralRaptor ha been making lots of algebra errors.
* UmbralRaptor integrates the Z from 0 to h.
<egg|phone|egg> Zz
<egg|phone|egg> Zzz
<egg|phone|egg> zzZ
<UmbralRaptor> zZz? ☡☡☡? ζζζ?
<egg|phone|egg> Did you get i11
<UmbralRaptor> yeah
<egg|phone|egg> Yay
<egg|phone|egg> So i33 is already a principal moment
<egg|phone|egg> You just need to parallel axis the other
<egg|phone|egg> Which requires finding how far down the centre of mass lives
<egg|phone|egg> Which is triangles
<UmbralRaptor> revolutionary triangles
<egg|phone|egg> Barycentre, 2/3h down
<egg|phone|egg> UmbralRaptor, yeah but their Revolution matters not
<egg|phone|egg> Wait
<egg|phone|egg> No I'm stupid
<egg|phone|egg> It does
<egg|phone|egg> I should sleep
<egg|phone|egg> !Wpn UmbralRaptor
* Qboid gives UmbralRaptor a triacontahedron anaconda
<egg|phone|egg> Snek
<UmbralRaptor> Note to self: your earring schedule is sufficiently messed up that you can be really hungry without realizing it.
* UmbralRaptor grab some ramen.
<UmbralRaptor> s/earring/eating/
<Qboid> UmbralRaptor meant to say: Note to self: your eating schedule is sufficiently messed up that you can be really hungry without realizing it.
* soundnfury was just about to comment on that
<SnoopJeDi> Counterpoint: the human body is adapted to intermittent fasting anyway :P
* SnoopJeDi has ‼opinions‼ on food
<UmbralRaptor> Please do not set the food on fire.
<SnoopJeDi> But the Maillard reaction!
<soundnfury> mmm, browned ducks
<soundnfury> (or possibly browned record-breaking steam engines)
<SnoopJeDi> no steam doesn't give you browning
Alaura has quit [Quit: Going away, see you this friday, 4-5 CST, love you all, stay safe <3]
<egg|phone|egg> Who is that
<UmbralRaptor> ¯\_(ツ)_/¯
<egg|phone|egg> Why am I not asleep
<UmbralRaptor> Sleep is fake, actually.
<soundnfury> SnoopJeDi: sure, but if you put the food in the firebox it'll brown :p
Profound has quit [Quit: ( www.nnscript.com :: NoNameScript 4.22 :: www.esnation.com )]
<bofh> what UmbralRaptor said. :P
<egg|zzz|egg> !wpn bofh
* Qboid gives bofh an osmium oxidizing brioche
<kmath> <sigfig> update: as far as i can tell this parser is correct but it's returning negative line numbers and runic unicode
<kmath> <barrelshifter> @FioraAeterna types of talk: smol, LARGE, long (haha), tall
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Ping timeout: 186 seconds]
<egg|cell|egg> !Wpn Fiora
* Qboid gives Fiora a barium polytope
egg|phone|egg has joined #kspacademia
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|phone|egg has joined #kspacademia
<egg|work|egg> !wpn whitequark
* Qboid gives whitequark a Fermi-Dirac cylinder
<whitequark> hi
egg|cell|egg has joined #kspacademia
egg|mobile|egg has joined #kspacademia
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|phone|egg has quit [Ping timeout: 186 seconds]
egg|phone|egg has joined #kspacademia
egg|mobile|egg has quit [Ping timeout: 186 seconds]
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|phone|egg has joined #kspacademia
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Read error: Connection reset by peer]
egg|phone|egg has joined #kspacademia
egg|cell|egg has quit [Ping timeout: 186 seconds]
<egg|work|egg> whitequark: hi
<egg|work|egg> (sorry was afk eating)
<egg|work|egg> !u ☡
<Qboid> U+2621 CAUTION SIGN (☡)
<bofh> It looks like a damn Z
<UmbralRaptor> Indeed it does. (Sleeping is dangerous?)
<kmath> <kevinschawinski> Hi @gaylordnational @Marriott why did you just increase the rate of my confirmed reservation without telling me? cc… https://t.co/0q9Mn6FaDW
egg|cell|egg has joined #kspacademia
* UmbralRaptor still isn't sure whose idea it was to host the biggest astro conference in the US at such an expensive chain.
egg|phone|egg has quit [Read error: -0x1: UNKNOWN ERROR CODE (0001)]
egg|phone|egg has joined #kspacademia
egg|cell|egg has quit [Read error: Connection reset by peer]
UmbralRaptor is now known as NomalRaptor
<egg|work|egg> !wpn NomalRaptor
* Qboid gives NomalRaptor a quokka
<egg|work|egg> NomalRaptor: how is your cone doing
<egg|work|egg> bofh: it's an old-style french "dangerous turn" sign https://fr.wikipedia.org/wiki/Panneau_de_virage_dangereux_(math%C3%A9matiques)
<NomalRaptor> egg|work|egg: better, I think.
* egg|work|egg pets the cone
APlayer has joined #kspacademia
* NomalRaptor looks at the latest xkcd.
* NomalRaptor wonders if someone will put solar panels on a cat. (do they count as hot to the touch?)
<e_14159> Well, they might be in the category "hurts if you touch them"
<egg|work|egg> !wpn e_14159
* Qboid gives e_14159 a Bose-Einstein canon with a ███████ attachment
<NomalRaptor> !cat e_14159
* e_14159 ███████ ███████ with a ███████.
APlayer has quit [Ping timeout: 207 seconds]
<bofh> !wpn NomalRaptor
* Qboid gives NomalRaptor a deviant nefarious platypus
* NomalRaptor slowly backs away from the platypus.
<NomalRaptor> !wpn bofh
* Qboid gives bofh a sub-calibre Glamdring
egg|phone|egg has quit [Ping timeout: 186 seconds]
APlayer has joined #kspacademia
egg|phone|egg has joined #kspacademia
<awang> Any of you hang out on #kspmodders?
<awang> Bit of definition confusion here
<awang> Someone here says that C# is interpreted down to bytecode
<Qboid> 4d 0h 0m 0s left to event #17: et al./Falcon 9 v1.2 [at 2017-12-08 18:20:00]. Say '!kountdown 17' for details
<awang> And "compiling is a destructive process, interpreting isn't"
<SnoopJeDi> The first statement doesn't really make sense, but this is that sticky issue of most "interpreted" languages not really being interpreted at all
<SnoopJeDi> e.g. Python
<awang> SnoopJeDi: In what way?
<awang> Genuine question
<SnoopJeDi> All the implementations people mean when they say "Python" are compiled to VM bytecode
<SnoopJeDi> You *can* interpret Python, but I'm not aware off the top of my head of any implementations people actually use that do this?
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Read error: Connection reset by peer]
<SnoopJeDi> anyway, AFAIK (I do not write it) C# is the same way, you compile for a VM and run it there, which makes sense because C# is very Java-like and Java runs on the JVM
<awang> OK, that's what I thought
<SnoopJeDi> I don't know what that person means by "destructive," but compiling can certainly mutate the patterns as writ in the human-readable code. Usually because the human did something stupid. Compiler design is all about doing this without changing the "content" of the code, but we're dangerously close to things I don't know about.
<egg|zzz|egg> !wpn bofh
* Qboid gives bofh an impedance-matched ███████
<egg|zzz|egg> !wpn whitequark
<SnoopJeDi> but like, yea if you write unreachable code, a compiler is likely to "destroy" that because there's no point carrying it around
* Qboid gives whitequark a zeta implosion
<egg|zzz|egg> !wpn Fiora
* Qboid gives Fiora an IEEE 488 scream
<egg|zzz|egg> !wpn котя
* Qboid gives котя a chocolate dip pen
egg|zzz|egg is now known as egg
<egg> !wpn NomalRaptor
* Qboid gives NomalRaptor a neptunium hydrargentium density
egg is now known as egg|nomz|egg
APlayer has quit [Ping timeout: 383 seconds]
APlayer has joined #kspacademia
<egg|nomz|egg> awang: can you try making a journal for your krash crash? I don't think we'll be able to diagnose it without that
egg|nomz|egg is now known as egg
<kmath> <8spinach> “i recommend you apply now to lock in this lower tuition” is a sound that murderers make lol
<awang> egg: I'm trying, but unfortunately I can't seem to get this to reproduce consistently
<awang> And I don't think the log from an hour-log play session would help?
<egg> it's annoying, but usable in theory
<awang> Alright
<awang> I'll just keep journaling on then
<egg> good luck :-p
<awang> Thanks
<awang> Looks like I'll need it
icefire has joined #kspacademia
<NomalRaptor> AAAASUGH!
NomalRaptor is now known as InertialRaptor
<kmath> <kevinschawinski> It’s never too late to start doing science! ??? https://t.co/Sg2EsX93up
APlayer has quit [Ping timeout: 383 seconds]
APlayer has joined #kspacademia
APlayer is now known as ADistraction
ADistraction is now known as APlayer
APlayer has quit [Ping timeout: 207 seconds]
<egg> !wpn InertialRaptor
* Qboid gives InertialRaptor an indium hatpin-like spheromak
<egg> InertialRaptor: AAAASUGH?
<egg> ... is that an acronym?
<bofh> I feel like it could be, knowing Astro.