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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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(asinx+bcosx)^2 + (bsinx-acosx)^2. How do I simplify this?
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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
15 more posts in this thread. [Missing image file: diagram.jpg]
Alright, I've been trying to figure this out for too long, help me out /sci/? The supporting cables AB and AC are oriented so that the components of the 360N force along AB and AC are 185N and 200N respectively. Determine the angles a and b.
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?
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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?
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i need to write the net ionic equation for alum + BaCl2 and for alum + KOH. can someone help me with this? its not homework, its practice questions which arent turned in, but i would like to understand how to do this because its important for future tests. can someone help me out? ill delete the thread after.
1 more posts in this thread. [Missing image file: Fundamentals-of-Biostatistics-97805(...).jpg]
I've got the following stat question and I'm having trouble figuring out what the appropriate one sample test is and whether it's two sided or one sided: The proportion of deaths due to lung cancer in males ages 15-64 in England and Wales during the period 1970-1972 was 12%. Suppose that of 20 deaths that occur among male workers for at least 1 year in a chemical plant, 5 are due to lung cancer. We wish to determine whether there is a difference between the proportion of deaths from lung cancer in this plant and the proportion in the general population. Is this a one-side or two-sided test? Also, I need to perform a hypothesis test and get a p-value.
3 more posts in this thread. [Missing image file: shusaku.jpg]
http://www.youtube.com/watch?v=ZOPP4ZBgnoA&t=2m30s At 2:34 it looks like there's a bit of static in the recording, right after the explosion. I figured it was the immediate bright flash that happens in less of a second that fucks with the focusing of the camera. ...but how does this happen?
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I'm getting the Higgs Boson simulated collision/decay tattooed on my thigh the 27th. I'm a Mathematics major with a focus in Physics, and I love the scientific and philosophical discussions that stem from the idea of a Higgs Field. I had one question, as I'm still an undergrad, about the second part of the tattoo. I want to get a standard equation for the Higgs but there are several to choose from. I want to know if the equation I'm getting is relevant to the main part of the tattoo. Picture related: It's the main piece.

Just clearing something up

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0.9999999999999999 is equal to 0.9999999999999999 1 is equal to 1
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\lim_{x\to0} tan {1\over tan {1 \over x}}?

"Liquid Nitrogen is a toxic chemical"

7 more posts in this thread. [Missing image file: _63350842_ap_liquidnitrogen.jpg]
>A teenager has had emergency surgery to remove her stomach after drinking a cocktail containing liquid nitrogen. >Doctor John Ashton, director of public health for Cumbria, said: "This girl is the victim of an irresponsible alcohol industry that's now competing on gimmicks. "Alcohol itself is a very dangerous thing if improperly handled and liquid nitrogen is a toxic chemical. It destroys human tissue." This "doctor" should be struck off. The most abundant element in our atmosphere is a toxic chemical? Well shit I'm dead then.
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if an infinite amount of time elapsed instantaneously, what would happen? yes I get this is an unblockable sword meets unbreakable shield scenario.
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If i wasn't told explicitly that I have work tomorrow, do I have to show up? It's thanksgiving here in Canada.
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Hey /sci/, I need your help. Now, I know it's homework and you probably think I'm in HS, but I'm just a very stupid college freshman who can't into simple trig identities. I just need to see how to do this problem. And somehow I still want to become a Chemical Engineer. :(
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>MFW people want to enter a /sci/ related field for the money and not the thrill of furthering human knowledge
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hey, /sci/, what do you think about mechanical engineering? is it good idea to study it and is it generally good profession in your opinion? it's first time on this board for me, so i am sorry in advance about any jimmies that i might have rustled with this question. also, pic unrelated
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Hey /sci/, I got a question that may be quite stupid... Why do animals lose features over time? Survival of the fittest tells us that features that make an organism more competitive in its environment will get passed on more frequently, but what does it say about features that were previously useful but not anymore? I don't mean features that actually become detrimental. Like I get why lizards that started living underground started getting smaller and smaller legs until they are now barely visible, because the legs are detrimental to their movement in sand. But what about features that are not actually detrimental, just kinda useless? Surely, having it there is better than not? So why do useless but not detrimental features "devolve"?
5 more posts in this thread. [Missing image file: 1348841966451.gif]
why do stars explode when they 'die'? exploding would require them to exert one last huge burst of energy right? But aren't they running out of energy which is why they are dying? it would make more sense if they just cooled down and no longer emitted light while still being a giant ball since gravity is so huge that it's holding it all in still






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