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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)?
7 more posts in this thread. [Missing image file: image.jpg]
Any help with this? The combustion of 1.00 mole of CH4, produces carbon dioxide and water and releases 802 kJ per mol. When 3.00 mol of oxygen react with a stoichiometric quantity of methane, what is Delta H for the reaction? The answer is -1.20 x 10^3 but how? Ive tried many different calculations but cant get that as an answer.
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.
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.
94 more posts in this thread. [Missing image file: 6a00d834518cc969e200e54f8a198e8834-800wi.jpg]
I feel sorry for math majors, wasting your lives. All math is addition and negative addition, a multiplication for example is just a method so you can add more stuff cause humans lack the short-term memory to memorize bigger numbers. Math is a discipline dedicated to teach you several methods to add and subtract numbers for bigger and more complex systems. In other words, math is just 1+1, you just learn small tricks for bigger numbers so you don't waste time, oh the irony. You should'v picked a better major.
2 more posts in this thread. [Missing image file: 11111111111111111111111111111111.jpg]
Hey almighty university students, high schoolfag here. I have a simple question. I will be doing a chemestry project (for the highest grade) about aminoacids and how they work in our body or nature. Do you guy know any intresting fields?
2 more posts in this thread. [Missing image file: 1344598382670.jpg]
What mathematics should I be familiar with if I'm interested in studying classical mechanics at a deeper level than babby's first physics? I've only taken the the basic calc 1-3 sequence and ODEs. I'm just interested in seeing how different it is than my understanding from the general physics classes, but I'm not majoring/minoring in physics and won't be taking these types of courses.

Partitions!

6 more posts in this thread. [Missing image file: red_screen_zoom.jpg]
Ok guys, I think I typeset it correctly this time. Let n be a positive integer, and let \lambda = (\lambda_1, \lambda_2,\cdots,\lambda_{\alpha}) be a partition of n, so that \sum_{i=1}^{\alpha} \lambda_i = n, where 1 \leq \lambda_i\leq n and \alpha\leq n. Then let f(\lambda) = \prod_{i=1}^{\alpha} \lambda_i. Prove that f(\lambda) is maximixed when \lambda contains only the numbers 2 or 3. Thoughts?
4 more posts in this thread. [Missing image file: 1361515909016.gif]
Evenin' /sci/. Is an electromagnetic wave just what happens when you combine a changing electromagnetic field and lightspeed lag?
6 more posts in this thread. [Missing image file: rlc.gif]
So I was in an EE lab last week. The instructor basically tells us to hook a DC motor up to a series RLC circuit powered by a function generator. 10V pk-pk. The ideal frequency used in the function generator was to be found. I believe the resonance frequency. So, (2pi sqrt(LC))^(-1). My question is... why are we using a DC motor with an AC signal? Is this really a thing or is my instructor crazy? Also, there are no ways to take measurements on this
1 more posts in this thread. [Missing image file: electromagnetic-spectrum[1].jpg]
How much wireless throughput could be achieved if the entire radio spectrum were available? I tried Google, but I don't really know how to phrase my search. I know 802.11n supports 248Mbps when given a 40MHz block and the radio block is about 300GHz wide, so does that mean 227GBps is about the upper bound for wireless data transfer?

Economics as a degree

9 more posts in this thread. [Missing image file: economics.jpg]
Anyone here taking Econimcs? What kind of math is involved, and is it a useful degree?
11 more posts in this thread. [Missing image file: 1354054447211.jpg]
How do you express 127/10 as a common fraction where the denominator is a power of 2? I read this exercise in a programming book with no solutions to be found. I realize this is an ultra pleb question, but can you guys show me the method to solve this?
4 more posts in this thread. [Missing image file: math.jpg]
Just finished my last math class (multivariable calc) for my engineering undergrad. Its kind of sad that I'm officially done with math. So I was wondering what math classes should I take after mutlivariable calc for fun? Anything that will help in engineering?
6 more posts in this thread. [Missing image file: xkcdickhead.png]
I don't understand well ordering... I understand that the axiom of choice has been found to be equivalent with some statement about well ordering sets but what is that statement exactly. Basically, what sets can you well order. If I am not mistaken, you can well order the reals, but as far as I know it hasn't yet be done. My main question is, what sets are well order-able? What are the requirements?
0 more posts in this thread. [Missing image file: Apple iproduct.jpg]
does anyone have an interesting tutorial series, or large self-directed project that focuses on object oriented programming? a book would be nice too, but i find projects more engaging, since it forces you to properly implement something (a skill i fiercely lack). i know about project Silk and project Hilo. http://msdn.microsoft.com/en-us/library/hh396380.aspx http://msdn.microsoft.com/en-us/library/windows/desktop/ff795783.aspx i'm just trying to see if there's other things out there
3 more posts in this thread. [Missing image file: 1356630163499.jpg]
Hey, /sci/, I wanted to ask, if maybe someone of you had any good materials about tensor analysis. I would be very grateful!
7 more posts in this thread. [Missing image file: 28ee3744e6866215d9c6fd92434cfc0d-st(...).jpg]
I usually don't do this but I need help, I have no idea on how to do a problem like this. In return here is Star Wars. That's science right Jasper Metals is considering installing a new molding machine which is expected to produce operating cash flows of $73,000 a year for 7 years. At the beginning of the project, inventory will decrease by $16,000, accounts receivables will increase by $21,000, and accounts payable will increase by $15,000. All net working capital will be recovered at the end of the project. The initial cost of the molding machine is $249,000. The equipment will be depreciated straight-line to a zero book value over the life of the project. The equipment will be salvaged at the end of the project creating a $48,000 aftertax cash flow. At the end of the project, net working capital will return to its normal level. What is the net present value of this project given a required return of 14.5 percent?
14 more posts in this thread. [Missing image file: what is this called.png]
sup /sci/ I need some kind of function, the simpler the better, that looks like pic related. Periodic, but with the times where it is positive and negative unequal. I was thinking I could just have a sine function plus some constant, but I'm not sure how to mathematically relate the constant to the ratio of positive/negative. Any ideas?






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