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/sci/ Science & Math

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Most viewed threads in this category

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?
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.
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?

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
16 more posts in this thread. [Missing image file: s9s.jpg]
Walking home and some guy bumps into me and instantly starts chatting shit to my face about aluminium being the best metal. I tried to stay calm and explained to him that iron was actually the best metal, but he wouldn’t take a hint. He just started throwing around words like “rust” and I lost it. Punched him right in his aluminium loving face. I HATE ALUMINUM SO MUCH.
8 more posts in this thread. [Missing image file: caesar.png]
Can you guys help me solve this "simple substitution cipher for a home work question? I cannot figure out how much it shifts, thank you! cjbt coz npon zjv fttk twrtuytfgt nj dtn o xjl. y coz zjv cpjvik dtn o xjl myucn
3 more posts in this thread. [Missing image file: sad-face.jpg]
>tfw you're doing a biology degree but don't want to work in a lab with carcinogenic and toxic chemicals >tfw you don't know if there are jobs for a biology major outside the lab What do I do /sci/? I'd value free time more than I'd value money
6 more posts in this thread. [Missing image file: phase.gif]
I understand the concept of enthalpy, however this question is throwing me off for some reason. Calculate the energy require to convert 1.70g of ice originally at -12.0°C into steam at 105°C. I dont really know where to start. I know the graph of phase transition has slopes for the heating of water, and a straight line for the actual phase change. Do I calculate E from each part from -12°C to 117°C, including the slope and plateaus?

physics help

6 more posts in this thread. [Missing image file: knight_Figure_08_40.jpg]
In the figure, find an expression for the acceleration of m1 (assume that the table is frictionless).
10 more posts in this thread. [Missing image file: chem3[1].jpg]
Any chemistry majors on here? I'm considering choosing it because I think drugs are interesting and I don't know what else to pick. Do you enjoy it?
0 more posts in this thread. [Missing image file: wm.jpg]
Are there any linguistics on /sci/? I'm doing X-bar theory right now in my syntax class and am having a really hard time with it and just want someone to explain it to me a bit better. Or any advice dealing with X-bar would be great.
4 more posts in this thread. [Missing image file: aewisdfsf.jpg]
My mother told me that when she was in school one of her teachers told her that this was the difference between a scientist and a mathematician: You're placed twenty feet away from a beautiful girl. Your goal is to kiss her. But you have to stop halfway there every time. So you get closer and closer but you never get to where she is. An engineer figures he'll get close enough to lean in and kiss her. A mathematician walks out of the room because it's mathematically impossible to get there. But eventually you reach a point where moving halfway requires more fine motor control than you as a human possess, and any effort to move forward at all will move you all the way to her. So what the fuck?

Khan Academy Alternate

13 more posts in this thread. [Missing image file: 2012-10-29 16.54.04.gif]
Hey everybody. I saw someone asked this in a thread last night, but they were a dick about it and I didn't see an actual answer. So, question stands: Since everybody here hates Khan Academy so much, what would you suggest as an alternate? > pic unrelated

at least it's not homework

6 more posts in this thread. [Missing image file: 1351201541399.jpg]
>tfw suck so fucking much at math >tfw I excel in all other subjects >tfw I got my final result for the first trimester and it's horrible >tfw when having nightmares regularly about how horrible this is >tfw getting fucking visions where I'm not accepted in my school of choice >tfw I don't want to make the girl I'm currently talking to my girlfriend because she's better than me at maths >tfw don't know how to fix my grades >tfw i am seriously considering suicide over this. help me sci
6 more posts in this thread. [Missing image file: Capture.png]
Could someone exaplin number 4 and 5. I thought I knew capacitors but I do not get this stuff at all. In number 4 isn't there still resistance from the R1 and R2 or not because Vcap has 0 voltage yet. Still there should be some resistance from R1 and R2. I'm confused on whats going on and Im not even sure how to ask the question. Thats how bad it is.

-1

4 more posts in this thread. [Missing image file: numberjumble.jpg]
We want to calculate the result of the following: x + (-1)*x = = 1*x + (-1)*x = (associative property) = (1 + (-1))*x = = 0*x = 0 This shows us that (-1)*x = -x (that is, a number multiplied by -1 gives its additive inverse). Now that we know that the result is 0, we solve the equation of x = -1: -1 + (-1)*(-1) = 0 But for this to be true, (-1)*(-1) must be the additive inverse of -1, hence: (-1)*(-1) = +1
0 more posts in this thread. [Missing image file: lK8qA.jpg]
prime get
40 more posts in this thread. [Missing image file: bug1.jpg]
Which is better? An exo- or an endoskeleton?
14 more posts in this thread. [Missing image file: 1PH29.jpg]
Hey guys, I was wondering if you could help me with the following chemistry problem: You are given the following data: H2(g) ? 2H(g) ?H° = +436.4 kJ/mol Br2(g)?2Br(g) ?H° = +192.5 kJ/mol H2(g) + Br2(g) ? 2HBr(g) ?H° = -72.4 kJ/mol What is the ?H° for the reaction H(g) + Br(g)? HBr(g) I've completed the question (I believe) and have obtained an answer. I just want to make sure that we're getting the same answer so I know it's correct. Thank you in advance.






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