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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?
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?

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/
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
4 more posts in this thread. [Missing image file: naphthalene-crude-250x250.jpg]
So guys, which among hexane, toluene and naphthalene would make a better fuel? Yes, this question isn't specific as to what the fuel it is, but this is related to combustion and I'm fucking stupid.
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?
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.
2 more posts in this thread. [Missing image file: 1347253519442.png]
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.
5 more posts in this thread. [Missing image file: 1301951501151.jpg]
Suppose that three numbers are selected one by one, at random, and without replacement, from the set of integers (1,2,3...n) What is the probability that the third number falls between the first two if the first number is smaller than the second? i got (n^2-2)/(n^2), but Im pretty sure that's wrong, any help? feel free to tel me to fuck off
4 more posts in this thread. [Missing image file: ones-zeros2.jpg]
I cannot believe this, there's no converter from decimal to binary if there's decimal mark. And Window's calculator can't do it either. What is the fuck with that. I'm doing this -> 93.125 - 39.5, and I have to do it in binary. I'm getting 1011101.001 for 93.125 and 100111.1 for 39.5. So when I do the math I get 10110101.100 where MSB represents that it's a positive result. So the result I actually get is 110101.100 and I have no idea if that's the right one because I cannot find any bin to dec converter that has decimal marks. I'm actually offended.
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++
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...

Potassium Perchlorate

8 more posts in this thread. [Missing image file: Potassium_perchlorate.png]
Herro, Just wondering if there is a known supply of Potassium Perchlorate in Australia? I have considered Synthing my own but the equipment is quite expensive. And Potassium Chlorate is quite unstable and virtually unusable as a substitute for this particular usage.
6 more posts in this thread. [Missing image file: Untitled.png]
Hey sci, I have a pretty easy physics question that has been bugging me. This question is on my practice exam for my 101 phys. >A child whose weight is 150 N lifts a pumpkin from the ground with a force of 50N. The force the pumpkin exerts on the child is: >a. Zero >b. greater than zero but less than 50 newtons >c. 50 Newtons >d. More than 50 newtons Now, I'm inclined to say B. since the pumpkin would not move unless it met those conditions. The reason I'm so confused is because of newton's third law, that forces are reaction pairs with equal magnitudes - you can see where a concept like this can get confusing. Does newton's third law only apply until accceleration occurs? Would the pumpkin exert 50N (the reactionary force of the child's lift) towards the ground? Would the pumpkin exert 50N+the pumpkins mass? Or would the pumpkin only exert it's weight? Can i get your answer and reasoning for this question?

Percipitate

5 more posts in this thread. [Missing image file: percipitate.gif]
I have a quick chemistry question, when precipitates form, do they use up all of the reactants in the solution to form the solid precipitate. For example if you put H2SO4 in a solution with the ion Ba2+, it would form the precipitate BaSO4, would this use up all of the Ba2+ in the solution?
0 more posts in this thread. [Missing image file: Da Vinci Wheel.jpg]
Howdy sci. Layfag with a question. This here is a video regarding hypothetical perpetual motion devices; you may have seen it: http://www.youtube.com/watch?v=287qd4uI7-E I understand perpetual motion is practically impossible due to friction, thus, these are not 'perpetual motion' machines. However, my question is this: Don't these machines qualify as being 'efficient motion' machines (i.e. motion that requires relatively little energy to initiate and sustain)? If so, could they not be sufficiently scaled and used for for practical purposes (e.g. to power a small electric device)?
6 more posts in this thread. [Missing image file: 450px-Kiss_Briseis_Painter_Louvre_G(...).jpg]
Could somebody please explain to me why Ephebophilia is wrong? Everybody on the planet has a huge problem with this but I have never in my life heard a good argument against it. When I was 15 I could easily imagine making the decision to have sex or not. Was I just extremely mature for my age? Please somebody explain this shit to me. Is this just another thing that society is retarded about like religion?
26 more posts in this thread. [Missing image file: dilysi_2000x2000.jpg]
What kind of music do you guys listen to while studying? I prefer a lot of upbeat electronic music (speedcore, chiptunes, glitch-hop, etc.) and while I feel like it really gets you going, at times it can be more distracting than motivating. On the other hand; while more downtempo music definitely isn't distracting, I don't seem to get much done while listening to it. inb4 silence master race
30 more posts in this thread. [Missing image file: 1340482452207.jpg]
hello /sci/ Entomology fag here. I have a general question for you. Where on the internet can i find a site dedicated to helping one identify insects/arachnids and whatnot. i am having one hell of a time identifying stuff i catch around my area. any great identification books out there?

Study tips? Study tips!

15 more posts in this thread. [Missing image file: Screenshot from 2012-09-24 02:11:25.png]
Always have the window opened when studying as excessive amounts of CO2 from inadequate ventilation can cause headaches and drowsiness.






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