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/sci/ Science & Math

Threads added between 2013/10/09 and 2013/10/16

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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.
13 more posts in this thread. [Missing image file: 472848lallarge.png]
Is there any way to get at least a decent estimation of my IQ online? I've never been formally tested, and I'm curious, but I'm not "pay upwards of $100" curious. Most of the "IQ tests" that come up with a quick google search are obvious scams.
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

Is Race a Social Construct?

3 more posts in this thread. [Missing image file: money cat.jpg]
So recently I've been reading about race and whether it is a social construct or not. I don't understand how people can say that there is no link between intelligence, talent, athletes and race when most of the scientists are Caucasian and according to IQ scores Jews score the highest and Asians score the second highest. Thoughts?
0 more posts in this thread. [Missing image file: Wim-Hof-in-ice[1].jpg]
What do you guys think about mental medicine? Not psychiatric stuff, but just using meditation to control and heal the body? There seem to be many VERIFIED cases of people doing things like healing wounds, recovering from illnesses, surviving extreme temperatures and living to do it again, REPEATEDLY. And ALL of them say it's just a skill they taught themselves through practice, training and meditation. Some hard examples: 1)The placebo effect, which seems to make people healthier just by convincing them they will 2)some effects of mass hysteria, which can cause people to display the symptoms of diseases they don't have 3)Wim Hof, the guy climbed Mt. Kilimanjaro, submerged himself in ice water for over an hour and ran a marathon both above the artic circle AND in the Nairobi desert in nothing but shorts and sandals, all without any damage to his body or even discomfort. What the hell is going on here?
13 more posts in this thread. [Missing image file: Desalination_chart.png]
What would be the best way to extract clean water from the sea? Desalination and other current methods seem to be way too expensive when dealing large scale such as with agriculture.
1 more posts in this thread. [Missing image file: 1380456383971.png]
Who else finds Chemistry to be easier than Biology?
0 more posts in this thread. [Missing image file: death_rides_a_pale_trike_by_mjranum(...).jpg]
If you die with a paper cut on your finger, will it keep healing for some period of time even though you're dead? How long do bodily functions keep working? Can your stomach still grumble if you died hungry? Does your brain stop working immediately, or do you linger for a little bit in a dream like state, which is why people claim to have seen bright light and shit in near death experiences?






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