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Comments:
<0> You can derive it all from that
<0> http://en.wikipedia.org/wiki/Dirac_equation
<1> can you?
<0> Well, I can't.
<0> But one can.
<2> hey thats great pthag
<2> thanks
<2> i have to pay the parking meter so im going to disappear for a bit
<3> hi kanzure
<4> hi Manyfold
<3> kanzure: so what did you learn about calculus since i saw you last time?
<4> Manyfold: The U.S. schools do not work like that. They usually give a week of review time before they do anything new.
<4> and even then they **** up your time much like a blackhole, effectively removing any time I have for reading on my own for myself
<3> kanzure i thought you would invest some work on your own :(
<5> ?
<4> Manyfold: sure, unfortunately I have no time to talk much more about this
<3> phos ??
<5> yo
<5> whats up>
<3> nothing new?
<5> nah
<5> just havin a drink, relaxing
<5> you>
<6> Pthag: its not fermi's exclusion principle its Pauling's
<1> pauli
<0> Some wop.
<1> :)
<0> Why did I think it was Fermi?
<0> I guess just because Pauli and Fermi end in -i
<6> DanF_DrC: no i am right its Pauling not Pauli
<0> Pauling? :/
<0> No, it definitely ends in an -i
<6> google it
<0> Sure, here's http://en.wikipedia.org/wiki/Pauli_exclusion_principle
<0> And the first link is hyperphysics.phy-astr.gsu.edu/hbase/pauli.html
<5> its pauli
<0> AH, there are websites using the term "pauling exclusion principle" :|
<6> umm, well his name is Linus Carl Pauling, must be due to crappy english spellings
<0> No. Wolfgang Pauli
<5> :D
<0> http://en.wikipedia.org/wiki/Wolfgang_Pauli
<6> bah, being drunk and talking about this stuff doesn't mix
<5> yes it does
<0> Pauling - discovered electronegativity, went on to be proponent of vitamin C-cures-all
<5> im enjoying myself anyway :D
<6> phos: not for me
<0> Pauli - did the exclusion principle and I forget what else
<5> Hotwire: what you drinking?
<6> phos: i was drinking bitter, i was out in cafe jazz, there was a wicked blues guitarist
<5> cool
<5> what city are you in?
<6> cardiff, uk
<5> ah
<5> im at home in NI at the minute
<5> just having a few magners
<6> anyway, its my bed time now
<5> you always say that
<5> youre no fun :(
<6> i have essays to write in the morning :(
<5> whyfor?
<6> phos: its because we are in such different time zones
<6> phos: because i failed a module in uni last year
<5> aww that ****s
<5> and its still only 10 past 12 here too
<6> where are you?
<6> i ***umed you were from the us
<5> nah
<5> ireland
<6> ah
<5> but im at uni in edinburgh
<6> with grace?
<5> indeed
<6> ah
<6> i see
<5> i thought the accect wouldve gave it away
<5> ...
<6> this still doesn't change the fact that my girlfriend is giving me disapproving looks
<6> :P
<5> hehe
<5> Grace is only virtual
<5> no disapproving looks required
<6> haha
<7> phos: ireland? where about?
<7> phos: there's a kde meet there next month
<7> phos: oh in edinburgh now
<8> ok, is anyone in here any good at Chemistry by any chance?
<4> try #chemistry, ;)
<5> JohnFlux: you still there?
<9> Hi.
<9> I have to model the displacement of an object that is dropped into a viscous liquid; the liquid is ***umed to have a resistive force F = kv directed upwards. When modelling the forces on the object, should it be kv - mg = mdv/dt or kv - mg = -mdv/dt? I was thinking -mdv/dt because the acceleration opposes the direction of velocity, so thus a = -dv/dt? Or am I wrong?
<9> Thanks for any pointers.
<0> I think the first.
<9> kv - mg = mdv/dt? Hm.
<0> Because dv/dt by itself can have a negative value
<9> Oh.
<0> You don't need to put the - in to make sure it *does*
<9> Well.
<9> There was one problem I got..
<0> Which is what I understand you think?
<9> Hrm, I see..
<9> Then I integrate and get 1/k ln|(kv-mg)/(-mg)|=t/m...v=(mg/k)(1-e^(kt/m))... which means e gets increasingly negative unless k is negative.
<9> Hrm.
<9> But this object eventually stops, so I'm guessing k will end up being negative. :|
<9> :\
<9> But the velocity is directed down, so that makes force equation valid..
<9> Alright, thanks. :P
<10> working on a surface tension... stuff
<10> lol
<9> Sounds tiresome.
<9> :P
<10> yeah :S
<9> Cool.
<9> I have a math project due in..... less than 3 hours which involves me modelling a displacement function of an object dropped in dishwashing liquid. :)
<9> Doing least squares regression now... and I can tell you, it's not pretty at all. :P
<10> hehe
<10> well im just learning what surface tension is
<10> Im a newbie lol
<9> Oh. :P
<10> pseudoXh4: tho I dont get some formula :S
<9> What kind of formula?
<9> formulas*
<10> well...hmm... pseudoXh4 let me read a bit and I'll let you know if I understand or not
<9> OK.
<9> YAY, finished my math ***ignment. :D
<7> pseudoXh4: yay
<11> What is the P term (pressure) in Bernoulli's equation for?
<11> is that like... the pressure on an area? So, if I have a pipe, with one side open to the air, would P=1atm?
<11> and if the pipe is conected to another pipe and the liquid in the other pipe is applying a presure it would be equal to the pressure from the liquid in the first pipe?
<12> arrummzen: well bernulli's equation deals with incompressable fluids......so the P is the pressure of the fluid....ie if the fluid were in a pipe P would be the pressure the fluid exerts on the pipe
<13> morning /Jreggelt!
<7> hmm surely pressure is a result of the repulsive force due to compressing the fluid
<3> hello
<3> how are you ?
<6> afternoon
<3> how are you?
<3> Hotwire , are you an native english speaker?
<3> a not an
<14> its a nethacker, its not a native anything, except insane person
<8> haha
<8> Great story here
<8> http://pages.infinit.net/garrick/jokes/physics.html
<6> Manyfold: yes English is my 1st and only language
<6> why?
<14> Boil: i like that
<8> Yeah
<8> It's great because it's true
<8> Nothing irritates me more than being told how to do things at school, when the method I have is completely valid, and works just as well
<8> Also, phrasing on the questions is awful
<8> A typical example would be a question that I got when I was a lot younger
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