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/sci/ Science & Math

Threads added between 2013/03/20 and 2013/03/27

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Most viewed threads in this category

9 more posts in this thread. [Missing image file: AoPS.gif]
Can anyone tell me where I can find the entire Art of Problem Solving series (including solution manuals) or any part of the series at all? I could only find the Introduction to Algebra book after scouring the typical torrent/direct download sites on the /sci/ guide.
12 more posts in this thread. [Missing image file: vanillin.png]
For those who've dealt with Vanillin + NaBH4 reaction: So I've got the vanillin/ethanol and BH4/NaOH solutions mixed together, and will add HCl until it's acidic. Then I plan on ice bathing this to get a precipitate of the vanillyl alcohol. Looking at some online procedures and a video, this is as far as they go, but one or two others take this precip and do a ethanol heating/evap process to it. So for those who have experience with this, is that really needed (or in other words, did you do that)?

Prime Number

26 more posts in this thread. [Missing image file: pythonlol.jpg]
Hey, /sci/, I'm in a basic programming class for python, and I'm having trouble understanding the in-class assignment that was given today. Could anyone help me out? The problem is as follows: A prime number is a number that is only evenly divisible by itself and 1. For example, the number 5 is prime because it can only be evenly divided by 1 and 5. The number 6, however, is not prime because it can be divided evenly by 1, 2, 3, and 6. Write a Boolean function named is_prime which takes an integer as an argument and returns True if the argument is a prime number, or False otherwise. Use the function in a program that prompts the user to enter a number and then displays a message indicating whether the number is prime. We're working in python 3.2
5 more posts in this thread. [Missing image file: 1347146347922.jpg]
/sci/... Why the fuck is probability so confusing? I know it shouldn't be but I am having trouble with grasping even the basic concepts for longer than a day or two even though pretty much all other mathematics stuff comes relatively easily to me. Take for example this question; You have 16 black cards and 14 red cards. If you randomly pick 10 cards what is the probability that you will pick 7 black cards and 3 red cards? I feel like it's at the tip of my tongue but I just can't reach it. And as I said, I am aware that it is babby probability.
15 more posts in this thread. [Missing image file: 1357459952669.jpg]
How would you start a proof of "there exists an infinite number of rational numbers between 0 and 1"? I know I have to do a proof by contradiction, but where do I go from there?
28 more posts in this thread. [Missing image file: 1364378189001.jpg]
Scifags, I heard the claim made that the facial template cosmetic surgeons use is based on the facial dimensions of a 14 year old girl because they’re considered to be the most attractive. Is there any scientific evidence for this?
11 more posts in this thread. [Missing image file: banach tarski.jpg]
So I was a liberal arts [anthropology with a focus in economics] major in college. I was disappointed with the quality of learning I received, and so I taught myself calculus. What should I teach myself next?
2 more posts in this thread. [Missing image file: Screen Shot 2013-03-26 at 20.45.32.png]
How do you do this /sci/? i've tried to do it with conservation of energy (gpe -> ke) but it doesn't seem right.
59 more posts in this thread. [Missing image file: 1341419639095.jpg]
Hi guys, I really hope I'm in the right place. Long story short >>Want a new tattoo >>Want something cool but hide-able with some meaning >>Love physics and such >>Why not something science? >> Alchemy circles So I know that Alchemy was the precursor to modern chemistry and a little bit about it's base wants and why it came about. But I was hoping some of you could educate me a little more in depth about the meaning behind the symbols and such. ftr I did not get the idea because of fma, but I do love the stylized nature of the show.
23 more posts in this thread. [Missing image file: Problem.png]
hello /sci/ /g/entooman here. I have got a problem that i dont seem to be able to solve. could you guys take a look at this ? pic related: the problem
9 more posts in this thread. [Missing image file: Solar Cells_1.png]
Well, well, well oil and nuclear power lovers; Solar power is knocking. http://www.nbi.ku.dk/english/news/news13/nanowire-solar-cells-raises-efficiency-limit/
6 more posts in this thread. [Missing image file: 1350766382255.jpg]
using the arthenius equation, i am given ln k" do i have to convert it to lnk somehow or do i just plug in lnk" forlnk
84 more posts in this thread. [Missing image file: 1362374185619.gif]
so I saw a fag on /fit/ claiming that there is ''close to no math'' on a Computer Science degree. Is this even remotely true? Excuse me for the stupid question, I am dumb. (I actually am dumb). pic unrelated
13 more posts in this thread. [Missing image file: 1.png]
Hi guys, Preparing for my organic chemistry exam, and I was hoping someone could confirm my answers to the following questions. Thanks! First question: naming the compound in the picture. I'm fairly certain it is N-ethyl-3-heptanamine. Correct?
13 more posts in this thread. [Missing image file: 7493417470_21824c4e9d.jpg]
hello /sci/ I have decided to make a flash game, but need to learn actionscript 3 in order to do so. However, I am what people would call a "script kiddy" when it comes to programming. How would I go about doing this? note: I can always google it sure, but the more efficient way is to ask people who have possibly been down the same road for things that worked for them.

Studies and standards for judging them

6 more posts in this thread. [Missing image file: bieber overalls harper.jpg]
From reading various places on the net, people often criticize studies for different reasons. The things I've picked up on are: If it's an experiment make sure the experiment is: * controlled (have two groups: some subjects who get a treatment and some subjects who don't) * randomized (subjects are randomly put in either treatment and control group) * double blind (experimenters don't know which group subjects are in) make sure the sample is: * representative of the wider population (e.g. not American college students, since they stand out from the wider American population: higher IQ, etc.) * large (i don't know when a sample size becomes large, i guess it's sort of arbitrary?) Questions: 1) What other things are there to judge a study by? 2) What percentage of social science/psychology studies actually fit these and other conditions to be considered "rigorous?" (e.g. the samples might not be very representative. According to this (http://scienceblogs.com/pharyngula/2013/03/01/we-are-the-weird/) most samples are Western, many of them American, and “67% of the American samples (and 80% of the samples from other countries) were composed solely of undergraduates in psychology courses”)
10 more posts in this thread. [Missing image file: 1360995293213.jpg]
Hey /sci/entists, I am having trouble with this question can you please help me Find both unit direction vectors for the same line? I have 2 points on the line (2,-3,-1) and (8,-1,2), how do I do this question? Thanks
30 more posts in this thread. [Missing image file: untitled.png]
44 more posts in this thread. [Missing image file: paper.jpg]
what's the best paper for doing math? I always use A4 blank, but do I know people that work on lined.

What do I approach this question?

4 more posts in this thread. [Missing image file: 2.jpg]
What is this asking me? I feel like the answer is yes, but I don't know how I would go about doing it






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