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/sci/ Science & Math

Threads added between 2012/10/24 and 2012/10/31

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Most viewed threads in this category

4 more posts in this thread. [Missing image file: Awesome+picture_e5d8ce_3986275.jpg]
Can anyone give me a link for 'Quantum Computation and Quantum Information' by Michael A. Nielsen and Isaac L. Chuang? Studying quantum computers and I can't find a link, help would be greatly appreciated since you're the smart board on 4chan. Thanks.
4 more posts in this thread. [Missing image file: 1350062944985.gif]
is C2- not paramagnetic? I just got this question wrong on a test. I thought if it had unpaired electrons in its valence shell, it was paramagnetic, and if all electrons were paired it was diamagnetic. C2-'s electron configuration is 1s22s22p4 right? so there would be two unpaired electrons in the 2p orbital, right? why did i get the question wrong?

Enthalpy problem

25 more posts in this thread. [Missing image file: 121012_0000.jpg]
I'm stuck on a problem and wouldn't mind some help: "The sun supplies energy at a rate of about 1.0 kilowatt per square meter of surface (1watt=1J/s). The plants in an agricultural field produce the equivalent of 20 kg of sucrose(C12H22O11) per hour per hectare (1 ha = 10,000 m2) Assuming that sucrose is produced by the reaction 12CO2+11H2O ---> C12H22O11+12O2 Change in enthalpy = 5640 kj Calculate the % of sunlight used to produce the sucrose." So far I've gotten: 1kW/m^2= 1000J/s 20,000g/342.01= 58.5 mol C12H22O11 I'm not sure about how to go about the hectare conversion....does it matter that it's per hour and that rate I already determined is per second? Or are they unrelated? Thanks in advance
41 more posts in this thread. [Missing image file: jim-al-khalili2.jpg]
What's the best area of physics to specialize in (in terms of employability)? Or, since every student will be making the same kind of predictions, would it actually be more probable to pick a random field and end up with higher employment chances than trying to make an educated guess which hundreds of thousands of other people will make and therefore ruin chances?
26 more posts in this thread. [Missing image file: ryQaj.png]
if scientist are smarter than engineers than why is engineering known as the hardest major in college?
80 more posts in this thread. [Missing image file: FX-992S.jpg]
Best calculator for a first year engineer? I currentrly own pic related. Also How do I into significant digits- rounding?

Fluid dynamics of entry flow into pipe.

1 more posts in this thread. [Missing image file: 416813_10151122370338494_810490480_n.jpg]
Fluids brahs I need help with my rationalization of this problem. What components of the velocity vector, and what direction to they change in, in the entry region of flow between parallel plates? Take z-direction to be direction of flow Take x-direction to be up and down Wide plates, so y-direction doesn't matter. I was thinking that velocity would be a function of x and z. The z-component of velocity would change in the x and z direction, and the x-component would change in the z-direction only. Is that right? I couldn't think of a reason the x-component would depend on the x-direction. Later on it becomes fully developed (v(x)=0). That's why I said it changed in the z-direction, likewise for v(z).
16 more posts in this thread. [Missing image file: 123543123455.jpg]
>tfw you dropped out of school >after few years you decided to go back >managed to get HS diploma equivalent >tfw colleges in my country have age limits for any kind of degree >including engineering, law, business, !LOLBIOLOGY!1!, any science for that matter >except maybe Arts >can't afford to move to another country Just wanted to tell you guys who are contemplating about rejoining college and pursue higher education, be grateful that at least you arseholes have a choice.
9 more posts in this thread. [Missing image file: Dodo_bw.gif]
can anybody explain this "3 species on earth go extinct every hour" idea? is this true? it seems impossible. it seems like eco-freaks are bending facts. i understand that we overhunt, but one species every 20 minutes? it just seems ridiculous.
1 more posts in this thread. [Missing image file: 1326322409038s.jpg]
Spatial dimensions are not the same thing as temporal dimensions: http://en.wikipedia.org/wiki/Dimension#Time Also, regardless of whether additional spatial dimensions exist on the macro scale in our universe, it's still a cool and mathematically viable alternate geometry.
8 more posts in this thread. [Missing image file: PHOTO_10392484_119137_16673969_ap.jpg]
If you were the Unabomber, what would be your modern day technique? Assuming you could buy anything from usual hardware stores and so on. >Watching Homeland, great show. This came to mind.
21 more posts in this thread. [Missing image file: 7157010997_2a92fa603c_o.jpg]
Why do students still buy textbooks?

???

2 more posts in this thread. [Missing image file: NOTHING.png]
Without graphing, can you use the slope to determine whether there is a solution for a system of two linear equations in two unknowns? Explain how. (pic not related)
40 more posts in this thread. [Missing image file: bug1.jpg]
Which is better? An exo- or an endoskeleton?
2 more posts in this thread. [Missing image file: UUZfV.jpg]
What causes epiphany?

Homework Thread

8 more posts in this thread. [Missing image file: 311590_492176587478466_908249165_n.jpg]
Yeah, I'm gonna be up front about this. I'm working on a thin-layer chromatography lab for analgesics. The analytes are aspirin, acetaminophen, caffeine, salicylamide, a standard solution including all substances, and an unknown solution. About a quarter of my class got retardedly high Rf numbers, like .96 and above, for all analytes. The mobile phase was .5% acetic acid in ethyl acetate. The stationary phase was a silica gel. The teacher either didn't quite know what went wrong or wouldn't tell us (she usually tells us). I'm working with the idea that our mobile phase may have been left in an open container too long, leaving the ethyl acetate to evaporate and making the concentration of the acetic acid too high, resulting in a mobile phase which is more polar than is ideal. Is there anything else I should consider? Forgive the lame joke.
42 more posts in this thread. [Missing image file: planck_1936_300.jpg]
Imagine that all liberal arts departments across the world were done away with, their students and instructors executed, and the formal study of them banned forever. What do you think the world would be like in 10 years? Just curious as to everyone's opinion
2 more posts in this thread. [Missing image file: IMG_3055[1].jpg]
What math paper should I take to see more patterns like this (if any)
10 more posts in this thread. [Missing image file: Picatinny.jpg]
Nikola Tesla tried to interest the US War Department in his "Death Ray" back in the '40s. Immediately after his death, his effects were stolen and the room's safe opened. The FBI claims that it never found the schematics nor any prototype. A few months ago, the engineers and scientists working at Picatinny Arsenal unveiled a weapon that directed lightning bolts at targets through laser induced plasma channels. Do you think they actually recovered the prototype that day and that it took them over half a century to refine it into a working state?
9 more posts in this thread. [Missing image file: Tan2000.png]
Eyh /sci/, tough science question here. Not sure I will get an answer but eyh, who knows? How do you solve a discretized Schrodinger equation on a non-uniform mesh in 3D. The problem is, if you use finite difference on a non uniform matrix, your resulting hamiltonian is non-hermitiant. IH. Tan in "A selfconsistent solution of Schrödinger–Poisson equations using a nonuniform mesh", JAP 1990 gives a solution for the 1D case (pic related), but it just doesn't extend trivially to superior dimension. Any insight on how to do that?






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