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/sci/ Science & Math

Threads added between 2013/07/03 and 2013/07/10

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Most viewed threads in this category

5 more posts in this thread. [Missing image file: RobertEdwinHouse.jpg]
"A university bookstore can get the book Courtship rituals of the American College Student at a cost of $4 a copy from the publisher. The bookstore manager estimates that she can sell 180 copies at a price of $10 and that each 50-cent reduction in the price will increase the sale by 30 copies. What should be the price of the book to maximize the bookstore's total profit?" This is a max/min problem from a book I'm using to self-study calculus, and I don't know how to model the equation. I'm guessing the quantity I want to maximize is Q=xy - 4x where x is the price and y is the amount of copies. I don't know how to make this an equation in one variable though. The answer the back of the book gives is $8.50. I want to know a solution though. Pic unrelated.
2 more posts in this thread. [Missing image file: 1367990821498s.jpg]
Chemfags. I need help calculating the lattice energy of Magnesium Bromide I have an exam tomorrow and this is most definitely gonna be on it. I really need to understand this. I don't exactly understand how to set it up Please help =( ok ?H of sublimation of Mg is 147 kj/mol ?H bond energy of Br2 is 193 kj/mol first ionization energy of Mg is 737 kj/mol second ionization energy of Mg is 1450 kj/mol Electron Affinity of Br is -331 kj/mol ?H of vaporiztion of Br is 31 kj/mol ?H formation of MgBr2 is -381 kj/mol Please help
63 more posts in this thread. [Missing image file: LSAAngle.jpg]
Ask a UC Berkeley Neurobiology major anything! Maybe you're considering applying here, maybe you are interested in learning more about it... whatever. I have been drinking a bit tonight, and just feel like hanging out and hopefully helping you guys. Here are some things about me: >Senior in the Molecular & Cell Biology department with an emphasis in Neurobiology >Transfer student who took a couple years off prior to returning to school >Considering PhD programs in computational and biophysical neuroscience programs (but I might just sell out and go to med school) >I work in a systems neuro lab that studies the barrel cortex (in mice) >I have a 3.98 GPA and am in the running for valedictorian pic is where I work

Neanderthal ape

2 more posts in this thread. [Missing image file: RealNeanderthal.jpg]
What do we actually know about Neanderthals appearance? How reliable can we predict skin, eye and hair color? Is a more ape like appearance even something we should consider possible? I know most of Danny Vendramini "work" is pure fiction but I think he raises a good point when he suggests that we may are mistaken in the human like appearance of Neanderthals. http://www.youtube.com/watch?v=mZbmywzGAVs Discuss.
10 more posts in this thread. [Missing image file: Normal force.gif]
Does the magnitude of normal force change with respect to angle? That is to say, if I want to find the components of the normal vector, would I apply trig functions a second time and get mg<cos(t)cos(t), sin(t)cos(t)>? Or is the magnitude a constant mg?
8 more posts in this thread. [Missing image file: image.jpg]
Can someone help me with this? Verify that: cosy/(1-siny)=(1+siny)/cosy by only changing one side. Helping my lil bro with homework but i cnt figur this out

Dark Matter

12 more posts in this thread. [Missing image file: h03_hs201013.jpg]
What does /sci/ think about dark matter ?
10 more posts in this thread. [Missing image file: 1338717693178.jpg]
So I'm going to university next year and plan to major in physics. What should I have as my minor If I want it to help me get a job? I live in Australia if that helps you decide.
14 more posts in this thread. [Missing image file: Screen Shot 2013-07-06 at 11.35.26 PM.png]
Failed it the first time. Took it again during the summer. It could have been worse I guess. This babby calc II is probably the hardest class I've ever taken though, so I ain't even mad. Professor would take off half credit for arithmetic mistakes. Whatever.. Hardest class you've taken and why?

That name of the equation at the bottom of the image?

3 more posts in this thread. [Missing image file: e18cdd_3407972.jpg]
5 more posts in this thread. [Missing image file: room.jpg]
This is a floor plan. Soundwaves cannot pass through any of the walls, only bounce off them. You are standing at point Z. Could you tell the difference between sounds emitted from points A,B,C and D without using volume differences? How? If not, why not?
28 more posts in this thread. [Missing image file: 1332352080818.gif]
I just graduated with a physics degree, have zero internships, and have no intention on going to graduate school or continuing in academia in any way. Anyone else in this position?
6 more posts in this thread. [Missing image file: 1351146357798.gif]
So I just realized that I can the 2nd and 3rd physics classes my school offers can be taken concurrently (E&M and Waves/Heat/Optics). I'm sitting at only 12 units right now, with Calc III, E&M, and some fillers. Would I be doing myself any favors by taking Heat/Waves/Optics this Fall as opposed to just waiting until Spring? I'll be taking Differential Equations, Circuits, and filler during that semester. I'm applying to transfer to 4 year universities this Fall, and want to maximize my chances of getting accepted somewhere decent. What say you, denizens of /sci/? Good or terrible idea?
24 more posts in this thread. [Missing image file: Hayley the Turtle.jpg]
Is overpopulation a problem we should start working on any time soon? I know we could probably make much more efficient use of land, but that would involve an overall reduction in the quality of life for the average person (smaller living space being the primary concern). Is it possible to achieve a stable population, or do we need growth - especially considering the improvements in medicine keeping people alive longer and requiring a greater younger population to look after the older people. Or do we perpetually need growth? Is it something we just have to accept until society can no longer function the way it does? Also, does EK still post here? I always wanted to mouthfuck her.
8 more posts in this thread. [Missing image file: 1370843464956.jpg]
Why are we so lazy? Today when I woke up, I spent almost an hour laying in bed thinking about a girl. Is laziness something in itself, or is it the result of some "lack?"
1 more posts in this thread. [Missing image file: perfoct.gif]
What's a simple tool for drawing polygons by connecting points described by 3D point vectors? Pic related, I want to draw simple 3D models of pyramids made out of combined triangles and a base plane.

Physics textbook and video series recommendations

6 more posts in this thread. [Missing image file: Physics.jpg]
>tl;dr pls recommend the best physics textbook and video series I'm learning physics I'm in the last year of high school (18 btw, pls don't ban me) My textbook is awful It's full of mistakes It's explanations are awful They use poor notation (for example, not once do they use arrows over vector symbols, and they never seem to use subscripts, and sometimes their formulas appear to have errors in printing) I've been watching Khan Academy videos, and while they sometimes explain things very well, at other times he seems to fumble around and leave out formulas. I tried watching the first few MIT physics lectures. While I already understood the concepts they were teaching, I found his explanations needlessly convoluted and complicated. So, can anyone recommend the best physics video series and textbooks? I've checked the sticky, but there are just so many options that it's hard to decide
2 more posts in this thread. [Missing image file: 1-Danish_Military_Police.jpg]
I know this may not be the place for it, but does /sci/ have any experience in the military? Whether it be mandatory enlistment or voluntary, would you guys mind sharing your experiences?


0 more posts in this thread. [Missing image file: 9780273752011.jpg]
Hi, guys, maybe it's not related topic, but I need a little bit of help... If someone could find me link for pdf Book: E-Business & E-Commerce Management, 5th edition by: Dave Chaffey Need to do paper for my exam so I'm running low on time... Thx
5 more posts in this thread. [Missing image file: url.jpg]
How neon signs work? What can colors generate?

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