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/sci/ Science & Math

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Most viewed threads in this category

12 more posts in this thread. [Missing image file: 1375535657225.png]
Why did Russian women evolve to have huge as fuck tits? Likewise, why east asian woman cannot into jugs?
21 more posts in this thread. [Missing image file: No Title.jpg]
A little problem that you guys might be interested!
1 more posts in this thread. [Missing image file: north-korean-tractor-simulator.jpg]
How many minutes does it usually take to reach LEO? I'm trying to figure out if DPRK has the ability to launch a satellite into orbit. I know there latest missile has a combined (3 stages) burn time of 4,5 minutes and is capable of atleast reaching 10.000 kilomters. Now I want to deterine if it goes fast enough in those 4,5 minutes to reach the magical speed of 27,500 kilometers per hour.
0 more posts in this thread. [Missing image file: calculus.jpg]
So I have one more exam to finish and I really like finding online notes from various US unis, but I can't seem to find classes that cover the following material closely (electrical engineering). In what subject is the following covered (engineering level not physics/math level) Integral transformations (Fourier transform, Laplace transform). Special functions (Gamma function, Beta function, Bessel function). Partial differential equations (wave equation, the equation of heat conduction, Laplace equation). Variational calculus (Euler equation).
8 more posts in this thread. [Missing image file: physics[1].jpg]
/sci/, I'M SO FUCKING FEED UP with all the magic tricks unrigorous bullshit that hinders the logical understanding of the physical sciences. I want a rigorous textbook on classical mechanics, no dx = y*dy, I'm feed up with that shitty notation where physicists manipulate "differentials" to make magic happen. Fucking physicists, they manipulate all kinds of shit in any way they want and they do it because they know they are going to arrive to the "right result" not because the method to arrive there is right. It's not clear when you can use it and when you cannot, this is bothering me too much. WHERE THE FUCK IS THAT TEXT BOOK!
7 more posts in this thread. [Missing image file: 2006112014310559569.jpg]
Why does fast flowing/moving air feel cold on our skin? Whether it's wind or the air blown at you by a fan, it always feels cold. Also, do fans cool the air temperature down or only circulate the the colder air from the floor across the room? I feel silly, but, don't the molecules in the air cause friction when they move and therefore heat?

Does psychokinesis enable chronokinesis?

2 more posts in this thread. [Missing image file: 20110802.gif]
If you could control the movement of everything in the universe, then you could make them stop moving, which would be equivalent to time-stop, and you could also make them reverse direction which would be equivalent to time-reversing. So doesn't the power of psychokinesis enable the power of chronokinesis as well, then?
0 more posts in this thread. [Missing image file: wave1.jpg]
What is the difference between a storm surge and a breaking wind wave?
16 more posts in this thread. [Missing image file: 11aaaa.jpg]
how good is /sci/ at designing and planning experiments? I need to do two experiments for uni over this semester, and i would really appreciate some ideas. Experiment one is supposed to investigate whether an insect has an adaptation that helps it deal with an environmental challenge, or to observe physical and/or behavioural responses to the environment being manipulated. I live in the tropics, and would like to experiment on green tree ants. I'm having trouble coming up with ideas. Experiment two can investigate pretty much any decent question about an insect or plant, again i've chosen green tree ants. I did an experiment on them last year for a similar subject in which i tried to find our whether colonies could recognise not just the smells of neighbouring ants, but a variety of smells of things which threatened them etc. I coated sticks with the scents of ants for neighbouring colonies, distant colonies, perfume, and lemon. I attacked a colony with these sticks several times a day for a couple of weeks, then checked how the ants responded when presented with these smelly sticks again. Sadly they didn't care, but my professors thought it was a good experiment anyway. So i'd like to try to investigate the same thing in a different way, and hopefully get some useful data this time. How else could i test this?
38 more posts in this thread. [Missing image file: Erwin_Schrödinger.jpg]
Why do smart people typically have such horrible eyesight?

Putnam/Olympiad problem of the day

3 more posts in this thread. [Missing image file: day[1].gif]
Daily problems at: http://math.harvard.edu/putnam/ To find threads: >>>/sci/putnam The cube ABCDA'B'C'D' has A above A',B above B' and so on. X is any point of the face diagonal AC and Y is any point of B'D'. (a) find the locus of the midpoint of XY; (b) find the locus of the point Z which lies one-third of the way along XY, so that ZY=2XZ.
6 more posts in this thread. [Missing image file: what.png]
So Fred Durst was being asked some questions and this one came up. Can someone explain to me how he got 123 x 2 to the 6th ( 64 ) = 7.8.7.2
10 more posts in this thread. [Missing image file: breaking math.png]
http://www.youtube.com/watch?v=aIggWlKr41w&feature=c4-overview&list=UUoxcjq-8xIDTYp3uz647V5A
52 more posts in this thread. [Missing image file: cox.jpg]
has there ever been a hotter guy in science than this man?
11 more posts in this thread. [Missing image file: okwhat.gif]
Please explain what's happening here. Is this some kind of magnetic semi-solid?
39 more posts in this thread. [Missing image file: mars-lac-glace.jpg]
Is it conceivable that a planet's surface could regularly alternate between being almost entirely dry and entirely flooded, with a cycle of 1000 years or more? Ideally it would dry out slowly then enter a period of sudden and torrential rain. Would there have to be glaciers or cloud or could it happen some other way? If so, what sort of orbit, rotation and sun type would it have? Thanks. Love, /lit/
1 more posts in this thread. [Missing image file: number.jpg]
I don't know if it is a dumb question at all, but have you a good method for studying maths? I don't have any problem with chemistry or physics, just arithmetic. My dad speculate that I have ADD, so I can't concentrate. The fact is, that I find really hard to understand most of the stuff and then remember and apply it to the exercise. I know it isn't anything as hard, we are studying asymptotes (I study in Italy ehw). TD;LR Have someone of you a good method for studying arithmetics? What can I do to learn it easier?
17 more posts in this thread. [Missing image file: 1359330862023.jpg]
So there is a chemical spill going on in the area that I live in. It's an unbearable smell outside that is similar to acetone. The news advised people to stay inside and close windows, and shut off air conditioners. Now the report is that it was a non-toxic chemical used to make plexiglass. Anyone have any idea what it could be, and is it ACTUALLY non-toxic? I've worked for enough companies to know that they cover up the real stories behind chemical spills.

Momentum and Energy

18 more posts in this thread. [Missing image file: Névtelen.png]
I have a question. There are 2 masses one with v speed, the other with 0 speed. The first start pushing the other untill they are at the same speed. The momentum must be the same before and after. Before m*v After 2*m*v/2 But the Energy of the system has to be the same too Before: 1/2*m*v^2 After: 1/2*2*m*(v/2)^2=1/4*m*v^2 if the new speed is v/2 and that is not equal. What is wrong here?

FLUORINE

5 more posts in this thread. [Missing image file: imgr43es.jpg]
Let's talk about Fluorine. Fluorine is the most reactive and most electronegative of all the elements. SO BOW DOWN This shit doesn't exist in nature in it's elemental form because it's so reactive but it will FUCK YOUR SHIT HARD if you attempt to RELEASE THE BEAST. Don't ask me, though, just ask all those stupid scientists that died trying. Hydrofluoric Acid; put it in glass Pyrex it's like FUCK THAT SHIT and eats right through it. Iron? No problem. Lead? Fuck you. Fluoroantimonic Acid; strongest acid know to man. You even think about touching this shit your whole family dies and your stupid cats. ALIEN BLOOD EAT YOUR HEART OUT. You can only store it in a Teflon container, which reminds me.. Polytetrafluoroethylene, aka Teflon; one of the most corrosive resistant and stable compounds known to man. Suzy homemakers reading this better check their panties. You can't fuck with this shit OH, I FORGOT, unless you have... PERFLUORODECALINE; this shit DISSOLVES teflon. LOLZ, YOU NEED FLUORINE TO BEAT FLUORINE. Bitches. Oh, and you can dissolve a shitload of oxygen in this and BREATHE LIQUID. Well, at least until you don't die from carbon dioxide build-up. But FUCK YOU only pussies die. Uranium Hexafluoride; you need this to isolate U-235 from naturally occurring Uranium to make an atomic bomb. Yep, that's right bitches, without fluorine all those stupid gooks would still be alive. HA HA! LOL, FLUORINE FUCKS YOUR SHIT NIGGERS AND YOU KNOW IT






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