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/sci/ Science & Math

Threads added between 2014/01/15 and 2014/01/22

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Most viewed threads in this category

20 more posts in this thread. [Missing image file: 1377915095410.gif]
How is 1 + 2 + 3 + 4 = -1/12 an analytic continuation? I know you can algebraically manipulate the zeta function to get the result but how is that a proof? Wouldn't you have to find a path in the complex plane and actually show how the function is analytically continued along the path? How do you mathematically prove it? Real proof, not intuitive argument I mean.
22 more posts in this thread. [Missing image file: electricshock.gif]
So what's the deal with electric shocks? I've had people tell me "It's not the voltage that matters, it's the ampere". Does this mean that getting shocked by my 12V 62A PSU is much more dangerous than getting shocked by my 230V 13A wall socket?
0 more posts in this thread. [Missing image file: Collatz1000mathematica.png]
Using wolfram|alpha, why can't I do this? f(x) = (x-1)/3, g(x) = 2x, c(x) = f(g(x)), c(5)
6 more posts in this thread. [Missing image file: 1517654_10151823556066765(...).jpg]
the technique used to make square watermelons is more disappointing then that one used to harvest nuclear energy
19 more posts in this thread. [Missing image file: image.jpg]
Does light move slower going through a transparent solid?
4 more posts in this thread. [Missing image file: 1350860927534.jpg]
If KMnO4 can oxidize alkenes into diols before cleavage, would Z and E isomers of 2-pentene both give 1,2-pentanediol?
1 more posts in this thread. [Missing image file: 1389875059277.gif]
how scientifically false is the bible? how creationist think judges will accept they BS on public schools? >inb4 rules we're talking about creationism.

Will USD-E kill USD?

9 more posts in this thread. [Missing image file: ip.bitcointalk.org.png]
Will USD-E kill USD? https://bitcointalk.org/index.php?topic=410254.0
5 more posts in this thread. [Missing image file: dogs.gif]
Ok /sci/ I am totally stumped on how to solve this integral, I don't even know where to begin. Anyone got any ideas? \int_{-\frac{\pi}{8}}^{\frac{\pi}{8}}\frac{cos^2x}{1+e^{xcosx}}dx
6 more posts in this thread. [Missing image file: calculus.png]
can we have a thread where we post math techniques we really enjoy using? mine is imaginary u substitutions. eg: the integral of 1/(1-x^2) substitute iu=x, idu=dx answer: i * arctan(x/i)
34 more posts in this thread. [Missing image file: dylan-sharhon_1st-year-ca(...).png]
hey /sci/ i was wondering if anyone could recommend a good, comprehensive book for learning calculus im pretty neet at the moment so i've got a bunch of free time and was eager to get a head start on one of the more difficult subjects (for me)

Help, mighty chemfags?

7 more posts in this thread. [Missing image file: 1390176585630.jpg]
>20.7g of HCL react with 28.4g of CaCO3 and both reactants are consumed completely. How much CO2 is released during the reaction if the other products weigh 36.6g? At first I thought I could just subtract 36.6g from the sum of the masses of the reactants, but some of the mass is lost to heat right? I can maybe find out how much heat the reaction releases, but I know no way to convert heat to mass.
7 more posts in this thread. [Missing image file: phy237 hw1 question.png]
Alright so I'm stuck here. I'm supposed to find h(t) in the form of h*cos(wt+\phi), but I don't know how to approach this without h1=h2 or phi1=phi2. Is this problem solvable?

Stupid Question Thread

23 more posts in this thread. [Missing image file: images.jpg]
Didn't find it, so I guess I'll start it. I'm trying to find the angle between a plane \alpha: 2x + 3y + z - 4 = 0 and the vector \vec{v} = [4, 3, 5]. It's supposed to come out to 56.3^{\circ}. When I try subtracting \angle(\vec{n_\alpha}, \vec{v}) = \cos^{-1} \left( \frac{22}{\sqrt{ 14 \cdot 50 }} \right) from 90 degrees I still don't get the right answer.
60 more posts in this thread. [Missing image file: image.jpg]
Is there a scientific explation for why some people are gay/bi?

Economics

3 more posts in this thread. [Missing image file: eminem-encore-07-pistol-i(...).jpg]
I'm completing my Economics BA but the actual economics courses ended by the beginning of the third year and were terrible in general, jumping from basics to dynamic models and differential equations so at the middle of the course everybody was struggling with math problems not being able to explain the application or the essense of the model. I want to self-study the courses once again before graduating and deciding whether I want to enroll into MS's. I need books on Micro/Macro. Something without tons of texts, like a review of basics. In uni we jumpstarted into Varian/Blanchard and transisted to Romer and Advanced micro by Varian during the same year. Needless to say it was a rush and a struggle for me. Should I read something before starting with Varian+Blanchard again? Or is it ok to start with micro-macro-1 skipping the simplistic models of micro-macro-0?
98 more posts in this thread. [Missing image file: mgtjVsu.jpg]
Can we get a study thread? Only hard, STEM degrees need to apply Do you listen to music when studying?Ambient, instrumental, choirs? How big is your study session and how many breaks do you take, how big are the brakes How many hours do you study per day during finals? How much sleep do you get? Can you stay focused after 12 hours? Are you proud of your grades given your work in to it?
24 more posts in this thread. [Missing image file: analytical image.jpg]
Hey /sci/ Im taking Analytical Chemistry this semester at my university and I was wondering if any of you guys have taken it and could tell me how easy or difficult the class was. Thanks in advance.

Music

7 more posts in this thread. [Missing image file: image.jpg]
/sci/entists, biologically explain the chills one gets from good music
1 more posts in this thread. [Missing image file: 1387126996120.jpg]
What would it take to make an accurate RNG predictor? It uses a mersenne twist and the seeds are kept server side. I am seriously considering paying someone to make this provided it can be done.






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