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/sci/ Science & Math

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Most viewed threads in this category

9 more posts in this thread. [Missing image file: 1345567159908.gif]
(asinx+bcosx)^2 + (bsinx-acosx)^2. How do I simplify this?

What's your Cognifit cognitive score?

35 more posts in this thread. [Missing image file: 1254546103964.jpg]
Cognifit is a website that assess cognitive abilities of tens of thousands of participants from all around the internet, gauges their score against a normalized scale from 0-800, where the global mean is 407, and places them precisely on the global bell curve. When you register, click on the Assessment tab and 'Start Assessment'. It should take around 15 minutes. I wonder what's /sci/'s score as it is clearly the most intelligent board on 4chan. Registration is free and you can just bullshit whatever information you'd like including email (no confirmation required), though it is recommended that you'll give your exact age so that you'll be given a precise comparison of your score to people within your age group. So what's your score /sci/? Mine's 519. http://www.cognifit.com/
3 more posts in this thread. [Missing image file: 1318315832432.gif]
I'm trying to rearrange the rydberg equation to find 1/n2^2 So far I've got 1/n2^2 = (1/n1^2)-(1/(?*R)) but when I try to find the log of 1/n2^2 my answer keeps coming out wrong. halp pl0z?
19 more posts in this thread. [Missing image file: 1349095731587.jpg]
Anyone else hate FOBs?? They are the shittiest part about university. They hang out in annoying cliques, refuse to speak English, and are stubborn as fuck. Nothing is ever their fault, and they are sooo damn rude. They are also the sneakiest motherfuckers. I had an account to a homework site, and when I was checking an Organic problem, the blittle bitch carefully watched what I typed in, and immediately logged in on her own computer. fuck im pissed at them
16 more posts in this thread. [Missing image file: 1345856422240.png]
>realized im not smart enough for engineering Theres nothing i want more than to excel in math and science, but maybe I'm just not cut out for it. I cant even do well in calc I. The thought of majoring in anything else makes me sick. I feel like every other degrees in college is garbage and not even worth my time/money. I thought someone of average intelligence that gave it 110% would be able to squeeze through the curriculum. I'm beginning to think that is not plausible. I recently transferred with a 3.95 GPA from a community college to university and i've never been so stressed in my life. My hair is falling out by the second and im getting migraines on the regular. What the hell do i do?
9 more posts in this thread. [Missing image file: 1290833021387.gif]
Who the fuck designed C++? I've never seen such a disgusting mess of a thousand rules and twice as many exceptions! Grah! Oh, you want to make a generic function? Here, just use template<class C>. Or template <typename T>. No, there's no difference, we just thought it would be fun with extra keywords. Now you want output, you say? Just use cout(). Of course, you should use cout << instead, otherwise it won't look good. No, you can't use << for other methods, don't be silly. Why is every fucking millimeter of C++ filled with stupid shit like this!? tl;dr: I mildly dislike C++

Simple Physics problem.

10 more posts in this thread. [Missing image file: PhysicsFun.jpg]
After solving a difficult physics problem, an excited student throws his book straight up. It leaves his hand at 4.0 m/s from 1.5 m above the ground. solve for time, use two significant figures/digits. Can anyone help me with this problem? ive been at it for a long time, the last few hours on, it on assignment and i cant figure it out.
9 more posts in this thread. [Missing image file: m2m1.png]
A block of mass m1 sits on top of a larger block of mass m2 which sits on a flat surface. The coefficient of kinetic friction between the upper and lower blocks is u1,and that between the lower block and the flat surface is u2. A horizontal force F pushes agaisnt the upper block, causing it to slide; the friction force between the blocks then causes the lower block to slide also. Find the acceleration of the upper block and the accleration of the lower block. This is all that I am given. I have no idea where to start. does anyone else know what to do?
0 more posts in this thread. [Missing image file: 225112_406144292781547_1184829564_n.jpg]
I'm trying to decipher a code from a game that's yet to be deciphered in the last 8-9 years. It's fairly complex and so far rumours are that it's impossible to figure out. "56114572785726118576436467243534527560192889521973 5364672496847560 19968477090889521972781670512164856114519199118003 6468895219911800 65128" V Link to more information. http://tibia.wikia.com/wiki/5611457278_(Book) This is the first piece of text, the text was created by the Bonelords, who used their eyes to blink code to each other to speak. Any ideas? :| I'm stumped.
11 more posts in this thread. [Missing image file: ....jpg]
Do you think encryption or coding is real... especially on computers... If someone develops computer programs and all of the definitions for like symbols and numbers and letters are constants so unless you had some way to hide the meaning of definitions other than slavery or fascist oppression... (Jews in education especially)... I stripped a server of its Hard-drive and CPU and then did a file recovery and basically saw a bunch of LBL employees discussing how to not do the right thing which could be a path do living badly and then eventually being evil, so I kind of noticed that a lot of this crap here is not really like discussions it's more of either over stimulating a person with RDRR equations or shit that does not exist and is half way into the paranormal section, I was just wondering of encryption ans certain forms of education are mental retardation in definition or devolution...

OFFICIAL BAUMGARTNER'S MACH FREE FALL ATTEMPT

46 more posts in this thread. [Missing image file: o-FELIX-BAUMGARTNER-570.jpg]
I don't know if this belong in here but... In 30 minutes. Link: http://www.rtve.es/deportes/directo/teledeporte/
15 more posts in this thread. [Missing image file: shit you think that no one else thinks.png]
1 more posts in this thread. [Missing image file: eschercopycopy.jpg]
Einstein says, any object with the speed of light would have an infinite mass. Infinite mass also means infinite dullness. So it would be impossible to stop this object from moving or even changing its direction. But infinite mass also means infinite gravitation. This gravitation would affect every object in the universe. they would speed up with infinite m/s^2 and follow our first object. Soon they will also reach speed of light and will also have infinite dullness and infinite gravitation. Now the whole universe is compressed in an one dimensional tail flying through the universe. This infinte compressed mix of mass and energy will collapse and release all of its power in one big bang. The big bang.
58 more posts in this thread. [Missing image file: SpaceX-Launch-1012-mdn.jpg]
Welp, the budget rocket had a failure. Surprise surprise. And the company is in full damage control mode, saying nothing is wrong and everything is okay because it managed to make it to leo because that's so hard. But if this happens on a cis-lunar trip? the cargo will be lost forever due to not having enough delta V. Shit, they're just lucky it wasn't an engine on the side, or it would have had to of shut down two engines to compensate for the torque. http://arstechnica.com/science/2012/10/that-smooth-spacex-launch-turns-out-one-of-the-engines-explod ed/
14 more posts in this thread. [Missing image file: 1342391101558.jpg]
How can I achieve momentary happiness easily? I have some depressive episodes and I don't want to take pills. I smoke weed, but the effects vary, sometimes, it helps me a lot, others just make me paranoid. Sometimes I crave for food, but I find this to be highly unhealthy and expensive as well. How can I, in the middle of a huge let down of life, gain some happy hormones going, even if for a moment?
2 more posts in this thread. [Missing image file: 1346187686368.jpg]
The function g:\mathbb{R}\to\mathbb{R} is differentiable in -1, g'(-1) = 2 and g(-1) = -2. How can I write, in a formal style, that \lim_{x\to -1} g(x) = -2 ? I know it has to do with g(x) being differentiable in -1, which implies its limit exists, but I'm not sure how to write it down properly.

Needles

10 more posts in this thread. [Missing image file: nervous as fuck don't move.png]
I have a needle phobia. Are there any medicine school people here who can tell me how this will affect me throughout my life? I've only had about 3 immunisations in my life, all forced. I've been to the hospital twice, one for fainting randomly which they had to put me under with some smelly gas which smelled like bananas and old socks. The other was to have a suspicious mole removed from my back, with the condition that I would come to without any needles in my arms - Which they abided by. I want to know how shit could go wrong for me. I don't know if you guys have a phobia, but it's the kind where you would rather die than do it.

Future battery chemistries

4 more posts in this thread. [Missing image file: 100_7226[1].jpg]
Currently, modern electric vehicles that come out have on average around 70 to 100 miles range. These use Li-ion/LiFePO4 battery packs that are relatively expensive for the amount of miles they give, inhibiting widespread EV adoption. But recently, some interesting shit's been bubbling up. Lithium-air batteries have a theoretical energy density approaching that of standard gasoline. Electric motors are 85%+ efficient. The very real possibility comes up of having automobiles that travel over a thousand miles on a single charge. Similarly, silicon-nanotube lithium ion cells also have a energy density around the lithium air mark. Given that these will likely start showing up commercially around the early 2020s, what kind of change can we expect in the world and vehicles themselves with such outlandishly extravagant batteries? Also, if anyone knows of any other really good battery developments, please post them here. http://en.wikipedia.org/wiki/Lithium%E2%80%93air_battery http://arstechnica.com/science/2012/06/lithium-air-battery-advance-could-be-jaw-dropping-improvement -over-li-ion/ http://www.extremetech.com/computing/126745-ibm-creates-breathing-high-density-light-weight-lithium- air-battery http://www.extremetech.com/computing/129299-silicon-nanotube-lithium-ion-battery-stores-10-times-mor e-power-lasts-6000-charges
3 more posts in this thread. [Missing image file: what am i even looking at.gif]
so I heard people saying nasa came out and confirmed that the footage from the film landing was false but we acctually went? or something like that? any truth to any of this?
30 more posts in this thread. [Missing image file: 200px-NIA_human_brain_drawing[1].jpg]
What do you guys think would be the end result of mixing every human race on this planet? Smarter? Stronger? Taller? More attractive? I am more curious about the intelligence of such a mixture. Do you think their intelligence would improve or wither as the races mix? Do you believe that intelligence genetic?






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