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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: 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.

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?
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
39 more posts in this thread. [Missing image file: 1345176197431.gif]
Why Mensa members are so arrogant?
14 more posts in this thread. [Missing image file: 1259555512308213773medieval king an(...).png]
You are sent back in time to the year 1000 of the European power of your choice. You can speak and write the language fluently and for your mystic knowledge you made a influential adviser. What is the first thing you teach people?
4 more posts in this thread. [Missing image file: 1321148222680.jpg]
Does anyone know of any free, preferably online program that lets you play around with lenses and design systems? Kind of like CircuitLab, but with lenses.
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)
11 more posts in this thread. [Missing image file: 1351532536210.jpg]
http://www.justin.tv/labwork#/w/4082944224 Some guys are doing surgery and putting magnets ina guys fingers. Come watch.
4 more posts in this thread. [Missing image file: 150px-Bouteille.jpg]
A bottle with the inside volume 50cl is half filled with water. The bottle (with the water and air included) weighs 0,3 kg. If you want to lift the bottle with your mouth by sucking air out of the bottle, how much air would you need to suck out?
20 more posts in this thread. [Missing image file: IMAG0201422868160.jpg]
Scibros, what's your weapon of choice? pic related.
17 more posts in this thread. [Missing image file: steak-large.jpg]
At what distance from earth would you have to drop a steak for it to be cooked medium rare by reentry into the atmosphere?

Car rolling to a stop problem

22 more posts in this thread. [Missing image file: race car.jpg]
Hey /sci/. Is it possible to calculate how far a car will go if it rolling to a stop (in a real life situation)? Are the only factors used to calculate this distance air resistance and static friction between the car tires and the road? Are there no other factors influencing how far a car will roll before stopping? Thanks in advance, /sci/
38 more posts in this thread. [Missing image file: 2iiaem1_medium.gif]
>that one kid in your class who asks 10+ questions every lecture when the answer is on the next slide
6 more posts in this thread. [Missing image file: oceanography.jpg]
what does /sci/ think of oceanography? I notice this board is mostly cs, math, and physics majors, and the more rigorous the more respect a specific subject gets around here. Oceanography sounds like a less competitiveness field, I noticed many of the textbook writers only have masters degree -- so I am guessing it's a neglected field and probably has few employment prospects. I've been thinking that might be a good reason to pursue it. Any thoughts, is anyone here interested at all in studying the oceans, currents, and water salinity?

i don't even

5 more posts in this thread. [Missing image file: wut.gif]
http://www.wolframalpha.com/input/?i=e^%28{{0%2C0}%2C{0%2C0}}%29 can someone explain to me why the fuck the off diagonal terms are not 0?
3 more posts in this thread. [Missing image file: ExoPlanet02.jpg]
Does anyone interested in distant-future energy sources know of any potential energy-harnessing method that would have a significant enough effect on the brightness of a star that the difference would be observable from light years away? The most obvious example would be solar energy collecting panels so large that they block a significant amount of the star's light, but I'm not sure if this could ever be feasible, even in a star system where the size of orbiting planets (and therefore the amount of building materials available) is a much higher percentage of the size of the star than in our solar system. I'm just wondering if it's possible that advanced alien civilizations might develop technology that would affect the brightness of stars in a way that's visible from Earth. Or the brightness of planets. I know artificial light on Earth is a teeny, tiny fraction of the light put out by our sun, but maybe an alien civilization might make lights much brighter? It just seems like at least SOME alien civilizations would, for SOME reason (weapons? energy?), develop technology that creates or blocks enough light that with the right observation methods we could detect it. The obvious problem would be telling the difference between normal light from stars and artificial light, but there might be some things to look for, such as a binary star in which one "star" moves very erratically or moves away from the other star entirely, or seems to appear and disappear. Bottom line is instead of looking for fancy signals in other parts of the spectrum, it seems like the best clues to the existence of alien civilizations might be found in good ol' visible light.






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