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/sci/ Science & Math

Threads added between 2012/09/05 and 2012/09/12

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Most viewed threads in this category

17 more posts in this thread. [Missing image file: srb-blades.jpg]
Does exsanguination (bleeding out) hurts? Where is it best to cut, is "down the road" on both arms and the jugular enough? How long does it take to die? Would vasodilators accelerate the process? Would it be any different if you were to drink alcohol or use drugs before doing it? Just asking, need to know.
20 more posts in this thread. [Missing image file: 61wx5q-DaHL._BO2,204,203,200_PIsitb(...).jpg]
Does anyone have a torrent of this book, or maybe an e-version they could upload? I have the international version, but this book is apparently the only international version in the fucking world where they actually swap the questions around. I need the US version so I can compare questions. Book is "Probability and Statistics for Engineers and Scientists (4th Ed.) Anthony Hayter"
21 more posts in this thread. [Missing image file: download_car.png]
where do you guys download math/sci textbooks from? library.nu and genesis are both down/gone :( is there a good torrent tracker just for books?
61 more posts in this thread. [Missing image file: Another_Mr__Uppity_design_by_Percyfan94.jpg]
Which major creates the most arrogant students? >I honestly think it's math. You guys learn one proof and you suddenly act like you know every secret of the universe.
8 more posts in this thread. [Missing image file: dickbuttbb.jpg]
Hey I'm having some trouble with this problem: A racing car moves on a circle of constant radius b. If the speed of the scar varies with time t according to the equation v=ct, where c is a positive constant, show that the angle between the velocity vector and the acceleration vector is 45 degrees at time t=sqrt(b/c). (At this time the tangential and normal components of the acceleration are equal in magnitude)
11 more posts in this thread. [Missing image file: 1334120448692.jpg]
A hollow, conducting sphere with an outer radius of 0.250m and an inner radius of 0.200m has a uniform surface charge density of +6.37×10^-6 . A charge of -0.500x10^-6 C is now introduced into the cavity inside the sphere. a)What is the new charge density on the outside of the sphere? b) Calculate the strength of the electric field just outside the sphere. c) What is the electric flux through a spherical surface just inside the inner surface of the sphere? anyone???

Dumbfucks that believe what they are told

68 more posts in this thread. [Missing image file: N.Tesla.jpg]
I hold that space cannot be curved,for the simple reason that it can have no properties. It might as well be said that God has properties. He has not, but only attributes and these are of our own making. Of properties we can only speak when dealing with matter filling the space. To say that in the presence of large bodies space becomes curved is equivalent to stating that something can act upon nothing. I,for one, refuse to subscribe to such a view.
22 more posts in this thread. [Missing image file: silverspider.jpg]
So recently I found this neat spider in my room and decided to keep it in a container for a few days, things are working out much better than expected, it eats any insect I put in there. I was wondering two things, What type of spider is it, my guess is a small orb weaver. And should I remove the insects it has killed and sucked on for while, or will it continue eating them later?
3 more posts in this thread. [Missing image file: 1345250129191.jpg]
Hey /sci/ i have a question to you. How a electrical engineer can work with music?

What would happen if world stops turning for one sec?

1 more posts in this thread. [Missing image file: dj_yaukskuk.jpg]
Yeah I'm very curious about that.
4 more posts in this thread. [Missing image file: tumblr_kq979vR0Hz1qzma4ho1_400.jpg]
>Thorium is a viable energetic source
2 more posts in this thread. [Missing image file: proof.jpg134567.jpg]
So a Japanese man claims he found the connection between prime numbers, which would be astounding. http://news.yahoo.com/mathematician-claims-proof-connection-between-prime-numbers-131737044.html I tried really hard to understand the article, but I couldn't make much of it. What do you guys think? Obviously the prime numbers make up mostly the corners, but the pattern is not 100%. Seems like nothing more than a decent correlation and that's it. Pic related; it's a basic version of his 'proof'.
7 more posts in this thread. [Missing image file: chain_rule.gif]
Can someone explain the Leibniz notation for the chain rule: dy/dx=(dy/du)(du/dx), how does (dy/du) represent f'(g(x)?
10 more posts in this thread. [Missing image file: tXRDv.jpg]
How does one do well in calc 2?
14 more posts in this thread. [Missing image file: Ayn Rand copy.jpg]
Pros and cons of Ayn Rand's Objectivist philosophy?

Multivariable ELO / maximization

2 more posts in this thread. [Missing image file: st_thompson_statistics_f.jpg]
Sorry for the confusing title but I can't find a better title. Here is the problem: Lets say you have an object with different properties {A,B,C} and a user that have to choose between two objects. Is there a method to find which properties are favoured? e.g. Lets say that {A,B,C} is chosen over {A,B,D} then we could assume that property C is favoured over property D. What is this called? Is there any general method for this? Thanks for any help!
6 more posts in this thread. [Missing image file: Lando.png]
Skimmed through my calculus book and found Lando Calrissian.
7 more posts in this thread. [Missing image file: popcorn.gif]
Are the hopes to terraform a hopeless dream, or is there actual truth behind the theoretical methods? Many have conjectured upon it, but the unlikelihood of the entire thing seems rather high. From geopolitical issues, to current levels of technology, to the fact that the small planet is slowly having it's all-ready thin atmosphere eroded by solar weather. If you were to terraform mars, how would you go about doing it? Artificial magnetic poles to prevent solar erosion? Algae? Forcing a green-house effect?
0 more posts in this thread. [Missing image file: sweat.jpg]
>the directions tell you to just sit there and smile
10 more posts in this thread. [Missing image file: grapefruit.jpg]
Grapefruit mercaptan is a chemical responsible for the characteristic smell of grapefruit and has the formula C10H18S. 10.0 g of perfume containing grapefuit essence was dissolved in water. An oxidising agent was added, which converted all the sulfur in the mercaptan into sulfate ions. An excess of barium nitrate was added and the mass of barium sulfate precipitate obtained was 2.7279 g, with no sulfate remaining in solution. What is the percent by mass of grapefuite mercaptan in the perfume, assuming that all of the sulfur present came from this mercaptan?






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