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/sci/ Science & Math

Threads added between 2013/06/05 and 2013/06/12

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Most viewed threads in this category

1 more posts in this thread. [Missing image file: 6677660251_2c932e618a_b.jpg]
Pro-tip on how to calculate eigenvalues with a TI 83 or 84 of matrix A with dimensions n x n: make a function: y = det([A] - X*identity(n)) and find the zeros of this function
6 more posts in this thread. [Missing image file: Sagan.jpg]
Hello fellow Astronomers, My name is Carl, and I wonder about every single one of the stars. All of them are big, wonderful, bodies of gas who spend every second of their day giving off heat and light. The stars are everything wonderful in the Cosmos. Honestly, have any of you ever stood outside and stare into the sky? I mean, it's just such an overwhelming sight, but the galaxies take it to a whole new level. It's an even more amazing sight than the stars themselves. Don't be afraid. The Cosmos are our future. We just have to stop this fighting before we destroy ourselves. The Cosmos is full of "star-stuff", and we're all made up of it. What part of the Cosmos do you like, other than the galaxies, stars, and "glorious dawns"? The Cosmos is our future home, and living there is going to be a very real heaven. (I was just gazing up at the Cosmos; sky was SO cash). You should all go outside and stare up at the billions and billions of stars. Thanks for listening. Pic Related: It's me and the Cosmos.
7 more posts in this thread. [Missing image file: 1365197760001.jpg]
Why are all fields of anthropology considered a "non-science" by the lot of you?
13 more posts in this thread. [Missing image file: 4567546754754.jpg]
I'm a faggot so please excuse me. I was reading about Newton's Laws of Motion and found this website (pic), it says that with rockets, the thing that makes then lift is the ground, the ground makes the rocket liftoff? What? I thought it was just the engines, and because they created so much thrust that alone caused the rocket to fly. Please help. Is the website wrong? http://teachertech.rice.edu/Participants/louviere/Newton/law3.html
10 more posts in this thread. [Missing image file: IMG_3973[2].png]
How do we solve this?
5 more posts in this thread. [Missing image file: sky.jpg]
> http://izt.name/code/xy/ > 32 KB How does it work?
10 more posts in this thread. [Missing image file: 1365271570085.jpg]
Why do people talk about the "coefficient of restitution" when talking about collisions? It seems like they're just giving a name to it unnecessarily. It's not actually a physical quantity like velocity or energy. It makes more sense to me just to talk about the kinetic energy before the collision and the kinetic energy after the collision. Otherwise you're just defining things and giving names to things unnecessarily.
0 more posts in this thread. [Missing image file: ab2.jpg]
Hey /sci/entists, I need to build fairly small (~5cm radius and 15cm length) nose cones, similar to those on commercial airliners for a physics experiment. These cones will be based on volumes of revolution of certain graphs (x, x^1/5, x^1/4, etc.) My problem is constructing these. I considered building a frame out of a lightweight malleable material, and then filling this with paper and wrapping the structure in aluminium foil. Any other ideas, however, would be greatly appreciated. It'd also be really helpful if anyone could propose a material with which I could build the frame (I was thinking of using the metal part of a spiral bound notepad). Thanks in advance.
6 more posts in this thread. [Missing image file: Terra_Preta.jpg]
I value Sci/s opinion. What do you guys think of biochar as soil amelioration. there seems top be a lot of small organisations out there claiming to show results but none of this is the most striking of science. Their web sites rave about the benefits of biochar and draw far out conclusions while they claim to be actually conducting scientific study into whether it has any effect or not. thers a lot of bias there. Evidence based or informed opinion please. Its a habit of certain woo or conspiracy environmentalist crowds to paint science as the ludite, stopping advancement and refusing to accept new cures for cancer and the like. Its just that the enthusiasm for and language surrounding biochar reminds me of that. Or is it just that we have amateur scientists involved in open citizen science studies who are seeing actual real results and getting carried away and shooting them selves in the foot by displaying bias and getting to excited by perceived success to remember the scientific method. Im not trying to be critical of the effect of biochar but rather of my own enthusiasm for it in attempt to know if im actually being critical or a victim of confirmation bias.
12 more posts in this thread. [Missing image file: 289px-Vacuum_Dewar_Flask.png]
had an exam question recently, nobody could figure it out: When using a dewar flask filled with liquid oxygen, why is a lid unnecessary? every vacuum flask i've ever seen has had a lid, any ideas /sci/?
4 more posts in this thread. [Missing image file: Hegel.jpg]
A train is moving at a constant rate. If it travels x miles in t hours, in how many hours will it travel y miles? Thanks.
6 more posts in this thread. [Missing image file: Eigenfunction.png]
Hey, I've been trying to teach myself math for the last couple of weeks, dashed through single and multivariate calculus and now I'm doing some eigenvalue problems. I'm okay with problems that are like, "show that this is an eigenfunction of (operator)" but I just opened a new book, and it wants me to find the eigenfunctions. I can understand intuitively that the answer is e^ax, because the integral and derivative of the function are equal to the function times a constant, but I want to know how less intuitive problems would be derived.
19 more posts in this thread. [Missing image file: implying blast.gif]
Okay. So I want to teach myself higher mathematics. I want to go for fundamental calculus->linear algebra->ordinary differential equations -> (advanced calculus of multiple variables/vector calculus [is there a difference? Doesn't seem to be]) -> number theory -> graph theory -> tensor calculus And then just learn general chem -> organic chem -> quantum mechanics Please advise.
27 more posts in this thread. [Missing image file: 1369553974070.gif]
If two particles are quantum entangled and one falls into a black hole. What happens to the other? Also lets say we make a video camera whos hard drive is made up completely of atoms that are quantum entangled with an exact duplicate harddrive and we throw the video camera into a blackhole and the camera somehow survives and is spewed out in another dimension or time or place and still retains its shape somehow. Could we be able to download whats off the harddrive we kept and see whats in it?
29 more posts in this thread. [Missing image file: cat.jpg]
Do vacuum cleaners work in space?
11 more posts in this thread. [Missing image file: probability_logo.png]
What is the best book on probability theory?
114 more posts in this thread. [Missing image file: 1365796956357.jpg]
Are there any ways too increase my IQ, or am I forever destined for a path of mediocrity.
56 more posts in this thread. [Missing image file: hmmm.png]
93 more posts in this thread. [Missing image file: Lizz_Tayler_the_pious.jpg]
I like Christianity and science, but there's one thing that scares me in both disciplines: infinity Am I the only one?
24 more posts in this thread. [Missing image file: fragezeichen cirno.jpg]
Why is this board called Science & Math? Doesn't that imply Math isn't a science?






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