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/sci/ Science & Math

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Most viewed threads in this category

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/
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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?
9 more posts in this thread. [Missing image file: 1345567159908.gif]
(asinx+bcosx)^2 + (bsinx-acosx)^2. How do I simplify this?
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/sci/, "how many atoms of phosphorus are in 5.60 mol of copper (ii) phosphate?" I already know the answer (using Avogadro's number), but why can't I use the percentage by mass to figure this out? Given percentage by mass, Phosphorus is roughly %16 of the compound. Why doesn't taking 5.60 * 6.022*10^23*0.16 work?

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.
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
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>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?
6 more posts in this thread. [Missing image file: 24-Brian-rainbow1[2].jpg]
Could someone help me out with this question? Its the very last thing on the problem set and its completely messing with me, I don't know where to start. A rocket designed to place small payloads into orbit is carried to an altitude of 12.0 km above sea level by a converted airliner. When the airliner is flying in a straight line at a constant speed of 850 km/h, the rocket is dropped. After the drop, the airliner maintains the same altitude and speed and continues to fly in a straight line. The rocket falls for a brief time, after which the rocket motor turns on. Once the rocket motor is on, the combined effects of thrust and gravity give the rocket a constant acceleration of magnitude 3.0g directed at an angle of 30.0 degrees above the horizontal. For reasons of safety, the rocket should be at least 1.00 km in front of the airliner when it climbs through the airliner's altitude. Determine the minimum time the rocket must fall before its engine starts. You can ignore air resistance.
0 more posts in this thread. [Missing image file: yahoo math.png]
> you can't solve this within 20 minutes
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>A sodium surface is illuminated with light of wavelength 3x10-7m. The work function for sodium is 2.28 eV. Find (a) the kinetic energy of the ejected photoelectrons and (b) the cutoff wavelength for sodium. This is an example from a lecture I missed on Monday to take my son to the doctor. Any help wold be appreciated.
2 more posts in this thread. [Missing image file: images.jpg]
Hello /sci/ Today I want to begin teaching myself the basis of the Standard Model. Online lectures are not my forte, as I often become bored or the lecture is too ambiguous. Maybe I'm just a dumbass, either way, I don't want to use lectures. What books does /sci/ recommend for learning about the Standard Model for particle physics?

Working is the worst thing ever

170 more posts in this thread. [Missing image file: 1330125978318.jpg]
>finish comp sci degree >get software job >have to wake up at 6am everyday to get to work >work 8am-4pm, get back home at 5 or 6 >have 4 hours before goin to bed >have to cook, eat, prepare my work for tomorrow >rinse repeat Holy shit I wish I was in college, real life sucks in college I'd wake up at 9 or 10, go to school for 3-4hours and then just do what I wanted the rest of the day! I need to either make a ton of money real fast, or go back to school and get a Phd? But I hear a Phd is hard work and being a prof takes up all your time... fuck, how do I make millions$$$ and retire early?
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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++
3 more posts in this thread. [Missing image file: phys.jpg]
Is speed the same whether an object falls freely or slides down an incline with no friction at some limit. See pic. The object on the slope would take longer to hit the floor but would it reach the same speed?
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Hey /sci/ 1/( x * sqrt(4x^2 + 1)) any idea on how to do this integral? I feel that its a fraction decomposition but i have done it with x and sqrt(4x^2 + 1) and did not get the right answer.
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http://youtu.be/_njf8jwEGRo
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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...

Linear Algebra

11 more posts in this thread. [Missing image file: null space.jpg]
i can not figure this problem out! can someone please help me out?
1 more posts in this thread. [Missing image file: Barracuda.jpg]
I'm planing on making replica fish that need to look mostly realistic. They need to withstand sun and tropical salt water. Any ideas on materials that can last for weeks on end? I'm looking at silicone but I don't know how to work with it since the pieces will be custom.
4 more posts in this thread. [Missing image file: ikea.jpg]
We all know the quadratic formula, but what's the general solution for an nth degree polynomial?






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