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/sci/ Science & Math

Threads added between 2013/01/02 and 2013/01/09

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Most viewed threads in this category

31 more posts in this thread. [Missing image file: mataa.png]
Why are germans so intelligent and hard working? Is it genetics? What's the deal? Germany is one of the most well-living country in the world despite the wars.
5 more posts in this thread. [Missing image file: 1346372891888.jpg]
I know very little about the universe or big bang theory, but I had a thought and would like to ask what /sci/ thinks about it. What if the universe is in a "second cycle"? The universe is expanding, but as black holes take in matter they gain strength. Black holes can also combine, making an even bigger one. What if once the entire universe is a absorbed into a black hole, the universe collapses in on its self, then bursts back open again? Just an unscientific hypothesis.
12 more posts in this thread. [Missing image file: dfw.gif]
if prime numbers can be easily guessed with stuff like the ulam spiral, why do people still think RSA is secure?
5 more posts in this thread. [Missing image file: transcription.gif]
Would a major in molecular genetics basically guarantee poverty? Is research the only viable option?
9 more posts in this thread. [Missing image file: 1352682211937.jpg]
Hi, doing some revision of normal distributions and came across a problem I'm having trouble with, anyone have any input? "A mixed box contains two types of chocolates with the following mass characteristics A: mean = 18.9g SD(A) = 1.2g B: mean = 22.7g SD(B) = 1.5g 1. What is the probability that the mass of the contents of a mixed box, which contains 6 of Type A and 5 of Type B, will exceed 235g? (Individual chocolates in the box are randomly selected) 2. What is the probability that the mass of the contents of a mixed box will exceed that of a box containing 10 Type B chocolates? (Also assuming random selection)" I'm just really confused by the mixture of the two normal distributions. I don't expect anyone to bother working out the answers, I'd be grateful if someone could just give a brief explanation. Thanks /sci/. Please don't hate me.
2 more posts in this thread. [Missing image file: m.jpg]
I understand how dopamine is released as a reward for doing something instinctively correct, like reproduction, or resting when you feel exhausted. It makes you feel wonderful as reward. But, why does certain music make you feel good as well? I can think of some songs that give me the famous music-goosebumps after listening to them. Why does this happen? Is it too, a reward?
58 more posts in this thread. [Missing image file: 1332655865879.jpg]
>36 ACT, above 4.0 GPA, 2350 SAT, multiple extra-curriculars, governor school, live in north dakota >didn't get into princeton >didn't get into u of chicago >didn't get into u of pennsylvania >didn't get into caltech >didn't get into cornell i'm killing myself
1 more posts in this thread. [Missing image file: question.png]
Hi /sci/, can you help me understand how to solve this problem? 1) Find vA 2) Find the incremental change in vA for a 2% increase in vI and use it to calculate the ratio ?vA?vI 3) Find the value for the incremental resistance of the nonlinear element N by linearizing the expression for iA about the operating point when vI=5.0V
2 more posts in this thread. [Missing image file: cincinnatus01.jpg]
If you believe in evolution then you also should believe in social darwinism freemarketfascism.org
8 more posts in this thread. [Missing image file: pc916.jpg]
Hi, could you help me answer this question I can't do. I have 10 upside down paper cups and beneath one is a red ball I line them up one after the other so the cup covering the ball could be any one from the first all the way to the tenth. If I turn the cups over starting from the first to see which contains the ball how would I work out the probably that the third cup I turn up is the one covering the ball?
18 more posts in this thread. [Missing image file: outlaw star.jpg]
Is there anything preventing an object in space from accelerating indefinitely? Other than required braking distance before arriving at destination?
12 more posts in this thread. [Missing image file: Mars_forest.jpg]
Would coniferous trees survive on mars? Which plants could?
9 more posts in this thread. [Missing image file: UUQkj.gif]
would /sci/ mind if i ask a hypothetical situation? let's say humanity (or whatever relates to it) transported earth multiple times and colonized a few planets and lasted long enough were signs the universe is ending is starting to show how could we avoid this "end of universe" scenario >no im not one of those idiots who believed in the Mayan prediction >no im not lost from /x/
8 more posts in this thread. [Missing image file: Deinonychus Antirrhopus.jpg]
Were dinosaurs really just large chicken-lizards as depicted in this picture?
7 more posts in this thread. [Missing image file: wizard-cat.jpg]
What are the best science related jobs available to someone with a high school diploma or GED? (not buying into the college scam)

Since /sci/ is a shithole

14 more posts in this thread. [Missing image file: 1332270900524.jpg]
and we haven't had this stupid ass debate in awhile: What is the best calculus book ever?
36 more posts in this thread. [Missing image file: anonymous.jpg]
If every post on 4chan had an image of the posters face, how would this influence communication?

help : multiple variable equation solving

9 more posts in this thread. [Missing image file: Sans titre.png]
Hello /sci, I need your help on something. I'm trying to use wolframalpha to solve a 6 variable equation. It doenst seem to work. Does anyone know a good site to do this on ? Thank you so much ! PS : Here it is 1797*a+899*b+2696*g=0 ; 1797*b+899*a+2696*g=3 ; 1652*b+826*c+583*f=-3 ; 1652*c+826*b+583*f=147580 ; 1652*d+826*b-583*f=147580 ; 1652*c+826*d-583*f=295163 PS2 : Me and my friend are working on the displacement field of a beam.
199 more posts in this thread. [Missing image file: 13746242.jpg]
Have you ever had to study anything so obvious that you could have easily figured out by your own in a matter of minutes or seconds? I have three: Bolzano's theorem. Rolle's theorem. Mean value theorem. I am baffled at how stunningly easy these theorems are and yet Bolzano and Rolle immediately get their names stamped in History for it. Not that they weren't great in mathematics but still... Anyone ever felt similar?
28 more posts in this thread. [Missing image file: Chinese room experiment.jpg]
I've been thinking about the Chinese Room experiment for a while, and there is something that sprung to mind, it's probably wrong, but I wanted to know what /sci/ thinks. Atoms and molecules act in the same way as the man inside the room does, they receive stimuli, and due to the laws of physics, an effect occurs. We are conscious beings, but our building blocks are not, meaning that the man inside the room might not be "conscious", but enough of them compounded with each other could produce something that is. Does this make any sense?






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