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/sci/ - Science & Math

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2648202 No.2648202 [Reply] [Original]

This is the way to spend a Saturday night!

>> No.2648216

No waifu on screen, wtf are you doing?

>> No.2648215

>Posting pictures of the work you're not doing on /sci/

This is the way to spend a saturday night!

>> No.2648218
File: 6 KB, 251x189, 1293239524171s.jpg [View same] [iqdb] [saucenao] [google]
2648218

This is the way to spend a Saturday night!

>> No.2648227

whats that work youre doing there? looks like math. and a high school textbook, you got an exam on monday ?

>> No.2648234

yes, all my frends ar out doing shit and im here working, lets see I have open right now:
Methods of Modern mathematical physics (vol. 1) Functional_analysis
Introduction to Hilbert Spaces with Applications
Relativistic quantum mechanics - Wave_equations
Quantum Mechanics Symbolism of Atomic Measurements

on my computer (I would buy the books but I dont have that kind of money)
and paper in front that I work on

lives great, and im glad im not the only one

>> No.2648239

nice watch man. real big face on it, therell be no reading that thing wrong. good choice anon

>> No.2648243

did you throw sun glasses away?

>> No.2648247

>>2648218

>way is this to saturday night spend

>> No.2648248

you vegetarian? only vegetarians would eat food that looks like shit

>> No.2648249

>>2648227
Multi variable calculus

>> No.2648252
File: 86 KB, 917x1280, EmmaRed2.jpg [View same] [iqdb] [saucenao] [google]
2648252

Community, ic.
Well do you have any questions about math/physics?
I'm bored and I happen to know everything

>> No.2648254

get some modern speakers

>> No.2648261

that pen is shit. take ur work seriously, anon, get better utensils

>> No.2648263

>>2648252
Yes, actually i have. How do i calculate this:
∫∫∫(y^2-y)dV over K where K is the finite body enclosed by the surfaces z = x^2+2y^2 +2x and z = 1-2y^2

>> No.2648281

>>2648254
They are modern, DALI Concept 2

>> No.2648285
File: 267 KB, 2400x1800, ohgodlol.jpg [View same] [iqdb] [saucenao] [google]
2648285

>>2648239
Oh god, this is hilarious.

>> No.2648288

>>2648202
what the fuck are you eating? it looks like some cheeseles lesange, get some cheese man... for all of our sakes.

>> No.2648289

>>2648248
Its lasagna god damn it. I made it my self, and i am quite proud of my self for accomplishing such an endeavour

>> No.2648299

>labelling your text book with those coloured sticky note things

What are you? A girl?

>> No.2648297
File: 610 KB, 2048x1536, 20101213_002.jpg [View same] [iqdb] [saucenao] [google]
2648297

>>2648288
I had cheese in it! Also, here is another of my other foods i have made.

>> No.2648296

>>2648285
this
>>2648239
your awesome

>> No.2648308

>>2648299
>implying i care about the color of my sticky note things

>> No.2648313

>>2648299
>A girl?
Also, yes.

>> No.2648323

>>2648202
where are you from, because a lot of the things in that pic seems familiar

>>2648289
>>2648297
nice, a lot of people cant cook nowadays, glad to see you can

>> No.2648332

>>2648323
Sweden

>> No.2648342

>>2648263
Well?

>> No.2648345

>>2648332
false alarm, unless you moved all your shit there recently?

>> No.2648360

>>2648345
No. What do you recognize?

>> No.2648374

>>2648360
mouse book and bowerbal

>> No.2648412

>>2648342
it seems he doesnt want to answer, so ill help:

first integrate the function relative to z between z = x^2+2y^2 +2x and z = 1-2y^2

should be something like (y^2-y)((1-2y^2)-( x^2+2y^2 +2x))

find the curve where the 2 surfasis meet:
z = x^2+2y^2 +2x = 1-2y^2
x^2 +2x = 1-4y^2
y = +-sqrty(-x^2 -2x +1)/2
divide it into 2 areas (for the + and -) and integrate rerlative to y from 0 to y = +-sqrty(-x^2 -2x +1)/2

this gives you and integral only of x that you can do normaly with the limits you get where y = +-sqrty(-x^2 -2x +1)/2 has a maximum and minimum x value

>> No.2648440
File: 79 KB, 882x484, fag1.png [View same] [iqdb] [saucenao] [google]
2648440

>>2648263
>>2648412

I was busy sorry. Also I don't really want to do this stuff to be hones.
anyway,

1) observe that the volume is symmetric with reference y, see pic
and thus "int -y" will be zero

>> No.2648455

I actually envy you, OP.

>> No.2648459
File: 48 KB, 852x626, fag2.png [View same] [iqdb] [saucenao] [google]
2648459

2) y^2 is invariant under y->-y, so its just 2 times the integral over the upper side, i.e. between y=0 and x(y), see pic

3) you can calculate x(y), so you integrate over z, then x and then 2

>> No.2648470
File: 218 KB, 700x527, MEWbrownblack.jpg [View same] [iqdb] [saucenao] [google]
2648470

>>2648459
then y, I mean

>> No.2648511
File: 52 KB, 885x586, fag3.png [View same] [iqdb] [saucenao] [google]
2648511

therefor it might be *pic*
but I might have fucked it up, whatevs

>> No.2648533

>>2648440
God damn that graph is sexy

>> No.2648545

>>2648511
Let me just find that answer sheet

Yes! pi/12 is correct. ty

>> No.2648565
File: 57 KB, 720x624, heart.png [View same] [iqdb] [saucenao] [google]
2648565

>>2648533
--> pic

>>2648545
any interesting questions as well?

>> No.2648581
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2648581

dammit op move that food before it gets on your textbook

>> No.2648590

>>2648565
Gotta get into Mathematica!

Also, cant i use spherical coordinates on that integral?

Well, i cant guess what you call interesting. I am currently studying multivariable. Ah, yes. Personally i think this is really uninteresting but this i cannot solve:

Determine, if it exists, the max and min of the function f:f(x,y,z) = xye^(x^2) on the intersection curve of the two surfaces x^2 + 2y^2 +2z^2 = 1 and z = x^2 + 2y^2

I will post my try, just want you to know im still here and dont 404 the thread (improbable as it is)

>> No.2648597

>>2648590
>xye^(x^2)
should be xye^(z^2)

>> No.2648598

>>2648296
>>2648285
Are you guys mocking me? :[

>> No.2648605

>2011
>still in school
OP, you're a shit-tier kiddo.

>> No.2648616

>>2648605
maybe she is in college? :o

>> No.2648631

>>2648616
College is a school, retard. College-kids are stupid, naive and immature. On top of that, they don't know shit about anything.

People under 25 should not be allowed on the internet.

>> No.2648643

>>2648202

watching community?
>brofist

>> No.2648651
File: 78 KB, 802x579, fag4.png [View same] [iqdb] [saucenao] [google]
2648651

>>2648590
for starters --> pic
there are two roots for that z, but one doesnt intersect

>> No.2648656
File: 76 KB, 784x669, fag5.png [View same] [iqdb] [saucenao] [google]
2648656

we find the intersection

>> No.2648678
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2648678

>>2648651
What now?

>> No.2648681

>>2648656
Linuxfag, I guess?
I still couldn't get the 3D antialiasing to work. Anyone got an idea?

>> No.2648694
File: 77 KB, 1014x715, fag6.png [View same] [iqdb] [saucenao] [google]
2648694

>>2648681
hehe, ich bins.
Und nein, nicht linux

@OP --> pic
here (for the wrong function without the z though)

>> No.2648705
File: 224 KB, 555x800, sportivogirl.jpg [View same] [iqdb] [saucenao] [google]
2648705

>>2648678
ah, lagrange-multiplyer etc. style.
thats actually a better way then my direct approach, since it's easier for higher dimensions...

I haven't used that in a while but maybe I take a look at it, sec.

>> No.2648711

>>2648694
"Ich" ist der Algebramensch?
Auch: Mist. Deppertes Mathematica.

>> No.2648715

Hey, op!

Is this calculus by Adams and Essex 6th edition?

>> No.2648717

>>2648715
No, 7th. WHy?

>> No.2648723

>>2648711
Hallo! Ich kann deutsche sprechen zu! Aber nitch zu gut

>> No.2648724

>>2648717
Just finished the last chapter last semester. (The one with the dessert). Just wanted you to know that I feel you, bro!

>> No.2648733

>>2648705
Thank you, that is kind.

>> No.2648743
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2648743

Ich hab schonmal gesagt, dass ich mit Algebra wenig am Hut haben generell, aber ja.
Erfinde einen anderen namen though..
Außerdem: nix gegen mathematica! :D

@OP, before I re-figure out why/how that approach works, I could compute/check the determinant if you want..

>> No.2648748

>>2648743
Please

>> No.2648780
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2648780

>> No.2648794

>>2648780
Well then.

I just got it though. P=(+-1/2, +- 1/(2sqrt(2)), 1/2)

>> No.2648810

>>2648743
Ich heiße auch nur durch einen lustigen Zufall Josef. Abgesehen davon mag ich Mathematica, aber das Antialiasing-Problem unter Linux stinkt.

>> No.2648820
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2648820

>>2648794

>> No.2648833

>>2648820
Yes

>> No.2648844
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2648844

>>2648833

>> No.2648868
File: 698 KB, 1839x2400, quereyeEmma.jpg [View same] [iqdb] [saucenao] [google]
2648868

machen wir einen "Ask a theoretical physicist anything (about theoretical physics)" thread

>> No.2649141

>>2648631
>imlying u not mad because you didn't get in and you are now working at KFC serving niggers chicken

>> No.2649147

im jelly bro

>> No.2649154

how do you do maths while drunk?

>> No.2649182

>>2649154
you dont.
you try and get pumped then say "fuck it" after 4 seconds

>> No.2649183

>>2648202

calculus.

College fag detected.

>> No.2649219

>>2649183
Why is he a fag for studying at a university?