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/sci/ Science & Math

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Most viewed threads in this category

66 more posts in this thread. [Missing image file: 232.jpg]
Cicada 3301 Recruitment puzzle is back. Anybody interested in IT, Cryptography and Freedom of information welcome. IRC: http://webchat.freenode.net/?channels=#33012013 Outguess: http://pastebin.com/KGfE6DVt Dropbox: https://www.dropbox.com/s/r7sgeb5dtmzj14s/3301 CicadaOS: http://www.youtube.com/watch?v=GGMrmsWxQ5E Twitter: https://twitter.com/1231507051321 Wiki: http://uncovering-cicada.wikia.com/ Mural chart: http://mrl.li/X2p8Ry
10 more posts in this thread. [Missing image file: models and bottles.jpg]
Hey /sci/, can you give me some tips on finding textbook pdf? Ebookee used to be my to-go place but most of the links are dead now. I've been combing google for hours but couldn't find any of my textbook. Can any of you help out a fellow scientist please? -introduction to molecular thermodynamics by hanson and green -The elements of physical chemistry 6th edition by atkins -Quanta, matter and Change - a molecular approach to physical chemistry by Atkins, de Paula and Friedman -Physical Chemistry-A Molecular Approach. McQuarrie and Simon -Molecular Quantum Mechanics. Atkins and Friedman -Biochemistry 3rd by matthews, van holde, appling and anthony-cahill -the organic chemistry of biological pathways by Mcmurry and begley -Advanced organic chemistry by bernard miller 2nd edition These are some of my txtbooks this semester, PLEASE HELP ;_;
1 more posts in this thread. [Missing image file: maxminthermo.jpg]
How do minimum (alcohol) and maximum (mercury) thermometers work? Here is one definition I found for minimum thermometer: >"The liquid used in minimum thermometer is alcohol in which a dumb-bell-shaped index is set. When the temperature falls, the alcohol column drags the index towards the bulb end but when the temperature rises the alcohol column expands and runs past the index without disturbing it. Thus the end of the index farthest from the bulb gives the lowest temperature attained in a day." How does it drag the index? And why doesn't it move the index when it expands? Is there some kind of animation anywhere. I couldn't find anything on Youtube. -- Maximum thermometer: >"Maximum thermometer is also a mercury-in-glass thermometer having a constriction near the bulb end. When the temperature of air rises, the mercury in the thermometer expands and forces its way into the stem past this constriction. But when the bulb cools none of the mercury above the constriction will get back into the bulb and then the length of the mercury remains the same. The end of the mercury thread farthest from the bulb registers the highest temperature reached in a day." Why can't mercury go back down past the constriction when it cools down? Why is the maximum thermometer slightly tilted? Wouldn't the expanded mercury past the constriction point go back down to constriction point when it cools down?

What's so bad about INFPs?

63 more posts in this thread. [Missing image file: wwswq.png]
So, I'm a medical student, but I'm also an INFP, a friend of mine seems to think this means I'm destined to fail at medicine. Why? I'm not sure what the NF means, but my friend was able to explain about perceiving and judging and I already knew about introverted/extroverted. That being said, from what I do understand, I'm introverted, which just means I do a lot of extra-research because I'd rather be doing that than socializing a lot of the time. And if I withhold judgment wouldn't that make me good at diagnosis? My friend does neuroscience, so I tend to trust his opinions on these matters, and looking the type up on Wikipedia it thinks I'd make a great writer which, oddly enough, makes sense to me. I never thought of it as a career path but I genuinely do love to write, just for my own satisfaction. If I don't write anything for a while I tend to get grumpy and/or every other thing I say is some sort of pun. Anyway, before this gets any more self-indulgent, what do you guys think? About personality tests? About my personality (doing the test I scored really high on every factor except I, which was 20, everything else was 60+. I dunno what that means, but maybe someone else does?)
18 more posts in this thread. [Missing image file: monkcat.jpg]
Guys, halp. A cannon fires a cannonball 500.0m downrange at a 45.0 degree angle. At what velocity does the cannonball leave the cannon? This is one a physics review sheet involving a lot of v=d/t type of problems, though most supply the velocity and ask for time. (Easy) I don't understand what to do with this problem, and the answer is already supplied. [70 m/s] I'd prefer to understand how to get to the answer rather that just copy it down, though. Halp Oh, and please define variables in whatever equations and try to make this as clear as possible, please.
11 more posts in this thread. [Missing image file: 119600981_Mpemba_372841c.jpg]
How the heck do you pronounce Mpemba ? I cant find a single definitive webpage. What the hell?

noko

0 more posts in this thread. [Missing image file: 476388.jpg]
>Hey, I am a NASA high school engineer scholar and would like some help answering a challenge problem if anyone would care helping... A Shuttle must perform the de-orbit burn to change its orbit so that the perigee, the point in the orbit closest to Earth, is inside of Earth's atmosphere. De-orbit maneuvers are done to lower the perigee of the orbit to 60 miles (or less). An altitude of 60 miles is important because this is where the orbiting spacecraft is recaptured by Earth’s gravity and re-enters Earth’s atmosphere. Calculate the minimum change in velocity (delta V or ?V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 236 miles and a perigee of 205 miles above the surface of Earth. Use the rule of thumb that below an altitude of 500 miles, for every 2 feet per second (ft/s) change in the orbiting space craft’s velocity its altitude will change by 1 mile. Any help would be appreciated, thanks
3 more posts in this thread. [Missing image file: NT.jpg]
I am in desperate need for the exercises on page 20 of this book. Could anyone please help me out? Also, general number theory thread. Are there any notably tough concepts in an intro number theory course?
0 more posts in this thread. [Missing image file: dinosexual.jpg]
??? ??? ?_??
11 more posts in this thread. [Missing image file: truth1.png]
>Begin last semester, August. >Full ride scholarship to my first-choice college >Studying Mechanical Engineering >Supporting Family, Gorgeous and Supportive Girlfriend, Great Roomates, a Fantastic Apartment Dorm (paid for), and I knew a ton of guys already in my dept. >Semester begins >Don't sleep >Poor time management >Assignments become increasingly unmanageable due to above >Fuck up royally and bomb the Calc 1 Final, and the Chem final. >These two are the heaviest weighted, and despite A's and B's in other classes, my first semester GPA is torn to shit >Loose scholarship >Dropped from the Honor's college >Having to re-take three classes this next semester, meaning I'll have to take Calc 2 and Physics over the summer semesters. >Feel like shit man.jpg >Briefly consider suicide >Realize how retarded and cowardly that sounds >Dust myself off, preparing currently for this semester >Taking "soft" classes in addition to raise my GPA >Family and gf still supporting me Things are terrible, but I feel OK. Not "good," but OK. Still, College isn't the same anymore. I'm not "excited" about it. I regret my decisions, but I feel that I've learned some valuable lessons, and that I've matured greatly from this experience. .. Does ANYONE hear know that feel?
3 more posts in this thread. [Missing image file: ps.jpg]
16 more posts in this thread. [Missing image file: dicks.png]
The reason why your friends have more friends than you do. Discuss
21 more posts in this thread. [Missing image file: 435353545.jpg]
sup
18 more posts in this thread. [Missing image file: 1358349182394.png]
Okay, this is what we have so far. We might have a connection between 4220220 and 332 and it's Decatur, Illinois IF we take the first number as a phone number and the second one as an area code.
49 more posts in this thread. [Missing image file: 1357864145427.jpg]
What are the limitations of building shit in space? Hoe big, assuming you had the resources, could you go before you had structural soundness problems? Are O'Neil cylinder type structures possible?

titrations

1 more posts in this thread. [Missing image file: a-thermometric-titration-281.jpg]
I'm currently doing my AH chemistry investigation on a thermometric titration between HCl and NaOH/ CH3COOH and NaOH, and I need to find some decent sources for background theory. Also, in the guide for the experiment, it just says "make graph with results", which is fine, but then it says "find enthalpy of neutralisation", which I am not sure how to do.
3 more posts in this thread. [Missing image file: A440waves.jpg]
Ironically /mu/ is retarded when it comes to this part of music since it deals more with acoustics than aesthetics. Is there any solid argument for the tuning A432 rather than A440? A lot of it is psuedoscience and correlations but I want solid proof
5 more posts in this thread. [Missing image file: Frechet.jpg]
I am learning french, and i'm wondering if anyone knows of any good french resources. I.e. websites that check grammar, actually good movies in french, french news, ect... Pic related, Frechet is french and discovered metric spaces. So general metric space theorem discussion.
3 more posts in this thread. [Missing image file: advice god.jpg]
Sup sci, been reading about trading recently just want to ask some question.. Is High Frequency Trading hax? How hard it is to start a HFT firm?
0 more posts in this thread. [Missing image file: VeY5N.jpg]
DONE






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