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/sci/ Science & Math

Threads added between 2014/10/22 and 2014/10/29

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Most viewed threads in this category

3 more posts in this thread. [Missing image file: ]
i want do cooling on water with a laser how should i start i don't want extreme temperature i just wanna cool water

Popper Continued

60 more posts in this thread. [Missing image file: ]
>>6829397 >Critical tests of this kind may be called tests of significance, and when such tests are available we may discover whether a second sample is or is not significantly different from the first. Fisher, Statistical methods for research workers, p41 >Is Fisher correct or incorrect to claim that a significance test can discover whether one sample is or is not significantly different from another? I still want to know what is wrong with this question. How should I phrase the question to get an answer from you?
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Why the fuck is everyone so obsessed with drugs at college that they cannot shut the fuck up about it. Even my goddamn American Government teacher said he used to smoke pot back in highschool. I don't give a fuck about drugs. I just want to learn. Jesus fuck.
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if you're a poorass college student post your college/major if you're a richass grad post your job info/company if you're a poorass grad justify why you got your degree >Sophomore in Chemical Engineering >Penn State
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Ok /sci/ i'm completely uneducated, i've literally never been to school. I self-taught myself how to read at 16. I want to get into maths and physics, so what would be the beginner of beginner books for a gigantic pleb like myself who will not be going to school?
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Question Seriously not trying to be a troll I wanted to try to understand the whole "universe without God" argument that Hawking made that was such a big deal and can it be simply summed up as "the universe pre-expansion always was" as it goes to a point where there is no "before" around it?
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Does light have mass? And if not. why is it constrained to a certain speed?
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What is the universe expanding into?

Interesting puzzle

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Can I please request some help from almighty /sci?
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https://www.youtube.com/watch?v=WJXN_Ro7idQ https://www.youtube.com/watch?v=6h7jN6x8FDQ A while ago my videos would inspire debate. I hope those times would come again. The last few times I've only gotten hostility. Well, The tone of these videos won't help, I bet. Two logical fallacies in modern astrophysics which I suggest are holding up progress on developing models for galactic clustering, dark energy and the big bang. Please discuss.
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Let's try some basic statistics on the theory of evolution >inb4 I'm not trying to start a rage fest I want to see what you think Alright so lets for the sake of overestimating assume the earth is 0.1% / 1 ppt carbon Lets also (also for the sake of overestimating) assume all this carbon is in a neat clump with other life sustaining elements continuously reacting into things So that comes out to about 650 km radius sphere of carbon which should be about 650,000^3 * pi * 4 / 3 kg That's our reacting mass of carbon which I intend to be a crazy high estimate Lets assume that every second the entire mass reacts into something random That's 60 * 60 * 24 * 365.25 * 4,500,000,000 reactions across 4.5 billion years The average protein weighs 55 thousand atomic weights so let's assume we're shooting for 20 thousand per protein here Lets also assume we need 200 proteins for a cell (forget DNA that's another matter) 20,000 * 200 * 6.022 * 10^-23 is the mass of our reaction goal Reaction mass / reaction goal mass = possible successes per reaction Possible successes per reaction * reactions (per 4.5 bn years) = total possible reactions Now set those numbers aside for a second Chance of successful reaction per reaction attempt Lets just look at the carbon making up lets say 1/3 the protein by mass and weighing 12 atomic masses per atom 20,000 * 200 / (3 * 12) = carbon to line up Lets say each carbon has a 1/2 chance to line up (keeping high estimates) Chance is 1 / 2^ carbon to line up 2^10 > 1000 Thus 2^n > 1000^n/10 In my head I solve that to be > 1000^10,000 By now I think you see where this is going Pls discuss
56 more posts in this thread. [Missing image file: ]
>Dark Matter >Dark Energy If that thing actually "exists" in any fuckin case. it isn't actually just older matter than 14-15 billion years ago, since their light haven't even reached solar system? making it invisible to us. Maybe Solar System actually is "dark energy & matter" undetectable from other star systems and observers
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How do I become a genius who has idea and concepts just click instantly?
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250x + 250y + z = 169 100x + 300y + z = 156 100x + 50y + z = 90 170x + 250y + z = 150 How can I solve for these variables? I'm not good at math. I use a plastic bottle supplier from China and she never gives me the breakdown of prices, just grand totals (x = one size bottle, y = another size bottle, z = shipping). It's hard to plan orders because I never know how much the total is beforehand.
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Hey /sci/, my little bro took the SAT earlier this month and he's just gotten his scores back. I haven't looked at it in depth with him but he says he got 1710/2400, which I know isn't good. He says he planned on taking it twice and didn't study on purpose for this one so he could (and I'm quoting the little asshat here) "get a baseline to map his progress and improvement". For having not studied, is his score (he's 16) even decent? TL;DR: 16yr old bro got 1710 on SAT without studying, is he a retard? >pic unrelated
139 more posts in this thread. [Missing image file: ]
Hi /sci/. Enlighten me on global warming/cooling/climate change. As a layperson, I only hear "hurr if you don't believe in global warming you're retarded" or "durr global warming is not real I said" from various media sources. And of course there are no links on any evidence. I want to take a glimpse at raw data but have no idea how to find it. What global warming actually is? What is global temperature? Is there evidence that global warming occurs? Is there any evidence that human activity is significant factor in global warming?

Math joke thread?

121 more posts in this thread. [Missing image file: ]
Can we get a math joke thread going? I'll dump what I have... mostly named "Oct 30" because I'm collecting them for a friend who's birthday is then, hopefully what I've got isn't pleb-tier.
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Dear Anon, 20 years ago, I buyed an HP48G calculator, which I kept during all my studies, and I am still using it quite often at work. I would like to buy another calculator, for use at home. I want it new (not second hand), and with RPN. I found HP35S, but reviews are not very enthusiasts... I need trigonometric functions, complex number, base conversion and basic programming. Is there any other manufacturer of RPN calculator than HP ?
8 more posts in this thread. [Missing image file: ]
Hey /sci/! How can I calculate the limit of Xn, when n->Infinity?
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What's usually the last field of math taught to a PhD math student? And which ones are the last three?






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