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/sci/ Science & Math

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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
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?
15 more posts in this thread. [Missing image file: grief.jpg]
>the faculty's student body representatives spent 700 euros of this semester's research funds on 'My Little Pony' brand plastic pony figurines.
6 more posts in this thread. [Missing image file: time.jpg]
what is the terminal velocity of a soccer ball falling from 1 AU distance towards the sun (note: it falls straight towards the sun with no gravitational interference from other planets, moons, etc.)
42 more posts in this thread. [Missing image file: Purple Galaxy.jpg]
Hey /sci/ I have a question. Are the currently "popular" theories only "accepted" because they haven't been proven wrong yet?
41 more posts in this thread. [Missing image file: 1352438043008.jpg]
What do you think of Helen's Fisher Types, it is mainly focused for dating/relationships: Explorer: (more dopamine expression) -- risk-taking, curious, creative, impulsive, optimistic and energetic Builder: (more serotonin expression) -- cautious but not fearful, calm, traditional, community-oriented, persistent and loyal Director: (more testosterone expression) -- very analytical, decisive, tough-minded; they like to debate and can be aggressive Negotiator: (more estrogen expression) -- broadminded imaginative, compassionate, intuitive, verbal, nurturing, altruistic and idealistic Explorers attract Explorers, Builders other Builders and Directors attract Negotiators and vice versa. Thought most people are a combinations of those 4, usually there is a primary and a secondary type combination that predicts most of behavior, e.g. Directer-builder or Negotiator-Director, etc. Fisher is a PhD in Physical Anthropology: Human Evolution, Primatology, Human Sexual Behavior. Discuss.
9 more posts in this thread. [Missing image file: 1358064627075.jpg]
Is there gravity underwater? Today I was in my swimming pool and it occurred to me that when underwater, I'm effectively weightless. I can float freely, which seemingly goes against the theory of gravity. I can spin, twist and do nearly anything in suspended or slow motion. Thus, I believe that gravity does not exist underwater. Prove me wrong. I also discovered you can get sunburned underwater. The cooling effect of the water means you don't feel the burn, though...
8 more posts in this thread. [Missing image file: 1346381465062.jpg]
Any perception of time, or continuity is actually an illusion. - Robert Lanza In other words, paraphrased by NASA astrophysicists David Thompson "When we look at the big bang or when we observe how quantum particles jump back and forth in time, we have the arrogance of assuming that time simply moves forward in a straight line and then we go on to see these time anomalies as unusual and counter intuitive. But there is no indication that our perception and memory define the arrow of time. All of this seems to suggest that our reality would completely collapse, or at the very least become highly inconsistent and random at any moment. But the reason we experience a rigid world with deeply structured laws of nature is because consistent patterns evolve according to mathematical principals.

Multivariable Calculus

2 more posts in this thread. [Missing image file: Level Curve.png]
Is my reasoning correct when describing partial derivatives at P for the function given by this set of level curves? Is there anything i'm missing? fx, the partial with respect to x at p is negative because as f(x,P) increases, the values of x are decreasing. fy, the partial with respect to y is increasing at point p because as f(P,y) increases y increases, so fy at P is positive fxx, this higher order partial is decreasing at a decreasing rate since the lines are getting closer together as f(x,P) increases, so fxx at P negative. fxy, this higher order partial is negative rate since the lines are getting closer together at a decreasing rate at as f(x,y) increases. fyy, this higher order partial is increasing at a decreasing rate since the lines are getting closer together as f(P,x) increases, thus fyy at P is negative.
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?
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!
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?
8 more posts in this thread. [Missing image file: image.jpg]
If someone was born 9,452 days ago, what is their birthdate? In return, a hairless bear.
12 more posts in this thread. [Missing image file: scr00009.jpg]
SpaceEngine thread should be here or on >>>/v/ ? On screen is a planet without night, in binary system






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