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/sci/ Science & Math

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Most viewed threads in this category

23 more posts in this thread. [Missing image file: bellcurve.gif]
I'm a physics major with an IQ of 110. My peers are noticeably faster than me at solving math and physics problems. I hear the average IQ in physics is 140 (and this is just in average run of the mill state schools, it's higher in the ivies), which is several standard deviations above the norm while I am barely above average. I don't feel smart enough to be in this field.
5 more posts in this thread. [Missing image file: 1314651884140.jpg]
Hey /sci/, i need some quick help since I'm not too keen on math. How does 2d^2-28d-480 factor to 2(d-24)(d+10) ?

Home chemistry lab

31 more posts in this thread. [Missing image file: Chemistry_Laboratory_-_Bench-M.jpg]
Greetings /sci/, I'm seeking advice on setting up an amateur home chemistry lab. I am a ChemE student currently working in a lab at a specialty chemical company, which has given me a general idea of what I want to stock my lab with, what I need to purchase, and what I can DIY for cheap. General applications I am interested in exploring involve extraction of solutes from organic matter, distillation, synthesis of various harder-to-find chemicals from commonly available reagents, to name a few. (No scheduled substances will be dealt with, to be clear). I have plenty of ventilated space to work with, and funds to purchase equipment, but I need some advice in procuring the following: *A digital analytical balance with .001g resolution, as cheaply as possible *A decent supplier of ACS grade reagents and solvents that will sell to amateur chemists without having to purchase through a company/institution account If any knowledgeable folks in my situation could point me in the right direction, I'd greatly appreciate it and will bake you cookies for your help :3
33 more posts in this thread. [Missing image file: 5af.jpg]
If evolution is real then how come rocks haven't evolved yet? Also, why are there still monkeys?
20 more posts in this thread. [Missing image file: charles-barsotti-you-have-logic-i-h(...).jpg]
There is no philosophy board so I will ask the question here. The engraved plate beneath this painting in the art museum says 'Monet'. Therefore, the painting must be the work of Monet. is this argument valid or invalid?
2 more posts in this thread. [Missing image file: diffeq.gif]
Ok guys, I am struggling a bit in my diff eq class and I was hoping that you could introduce me to some good online resources (websites, Youtubers, etc.) Particularly, we recently started second order diff eq and the whole real vs complex root deal is confusing me. Also, someone in the lounge mentioned a method in which you can determine the particular solution without having to make any guesses by first finding the homogeneous equation, and then computing an integral using it and the wronskian. We didn't cover this. What is it called?

meteorite or meteorwrong?

15 more posts in this thread. [Missing image file: 20130826_160858.jpg]
Hello. I found this near drumheller in Alberta, Canada. I'm fairly sure it's a meteorite but it doesn't hurt to have others opinions. I can take more pics if people are interested.
47 more posts in this thread. [Missing image file: no homework.png]
Help with problems which are certainly not homework thread. Post problems that you need help with here.
25 more posts in this thread. [Missing image file: AmericaFuckYeah-fuck-yeah-post.jpg]
1+1=6 2+2=?
27 more posts in this thread. [Missing image file: cardinal.jpg]
Can someone explain frequentist statistics to me? It seems like this framework is widely used throughout science to design and conduct experiments / test hypotheses, but I don't really have good grasp of the concepts. In particular, what does "statistical significance" mean in the frequentist viewpoint?
1 more posts in this thread. [Missing image file: dat blur.jpg]
I just picked up a TI-82 STATS from a charity shop for $4.99. You can get Wolfenstein on here, right? If so tell an anon how? Time to relive my childhood.
3 more posts in this thread. [Missing image file: 4chan.jpg]
I have just been reading into special relativity. And I was just wondering, if you have an object travelling close to the speed of light and then you have a sound wave emitted from one end of the object would the wave behave differently due to the objects contraction or would the wave propagate through it as if it was at rest? This might be a stupid question, but hey why not.
3 more posts in this thread. [Missing image file: carina-nebula-dust-pillar.jpg]
Why is the universe so god damn beautiful?
4 more posts in this thread. [Missing image file: didhedied.gif]
What would happen if a human swam over this hole? considering the hole is 3mm and a person is big
7 more posts in this thread. [Missing image file: 1.jpg]
Hey guys. What exactly are Chem trains? Can you redpill me on it?
15 more posts in this thread. [Missing image file: Untitled.jpg]
Is the mains electricity valued as the effective value or the maximum value? Where I live it is 220v. If it's the effective one, then the maximum would be 308v, if it is the maximum, the effective would be 157v. Which one is it?

Trig double angle equation help

9 more posts in this thread. [Missing image file: Inline11.gif]
Hey /sci/, I'm studying for a math test and am seriously stumped at one problem. Find the (real) values for A, B and C for all values of x: (5cosx-9sinx)^2=Acos2x+Bsin2x+C I know to start by expanding (5cos(x)-9sin(x))^2 into 81sin^2(x)-90cos(x)sin(x)+25cos^2(x), and use the double angle formulas from there. I can get the value for B easily, 45*2cosxsinx=45sin2x, and since it's negative B must equal -45. But I keep ending up wrong with A and/or C. I know which formulas to use, but I don't seem to get how to use multiple formulas simultaneously. Please help me, /sci/, I've been stuck on this part for over a week now.
0 more posts in this thread. [Missing image file: Euler's Function.jpg]
Help /sci/ I don't understand Euler's function. pic related, Euler's Function
3 more posts in this thread. [Missing image file: 1381803361131.png]
This is probably such a trivial question, but how does resistance work? >4.2v output from a battery + a strip of wire reading 0.6ohms Is it a direct subtraction, ie. 4.2v - 0.6ohms = 3.6v? I'm fiddling with my multimeter and testing various stuff: >battery is 4.2v >internal resistance of flashlight is <0.01ohm >bulb filament is 0.6ohm >reading the voltage at the bulb yields 3.0v If it is a direct subtraction, why am I losing an addition 0.6ohm? >expensive flashlight, don't want to replace it >problem was only recent as I noticed dimmer output
12 more posts in this thread. [Missing image file: Pi.jpg.png]
we know that is impossible but, seek two positive real numbers such that the resulting division of pi






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