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/sci/ Science & Math

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Most viewed threads in this category

12 more posts in this thread. [Missing image file: 45345365635.jpg]
Is there any /sci/ence behind eating your own scabs, boogers, or loose/dead skin? And possibly any long term health effects of doing so? Since as long as i can remember i have done everything mentioned above. I'll feel around the inside of my mouth with my tongue and then chew and swallow any loose pieces of skin. I like to bite off any dead skin around my fingers and chew on it for awhile. If i have a scab that's loose i'll pick it and eat it. I also dig around and eat my boogers. Sucks when you get a hair but i find the juicier the better... As gross as it is, i have always been curious about it.
60 more posts in this thread. [Missing image file: bulge.jpg]
Why are straight men sexually attracted to cocks but not to vaginas? What's the evolutionary explanation of this, /sci/?
8 more posts in this thread. [Missing image file: 299423_10151410833854966_1241385857_n.jpg]
hey hey hey, ive been wracking my brain and think it broke. so long story short i'd like help please. so the question is: What is the major product which results when (2R,3S)-2-chloro-3-phenylbutane is treated with sodium methoxide in methanol? i believe that the mechanism for this reaction is EN2, since a strong base is present (methoxide). also EN1 would lead to a methyl shift and sn1 and sn2 wouldnt result in any of the supplied answers (its multiple choice) i went through the problem and have the correct product and only one product can form because there is only one hydrogen to enable anti elimination. the phenyl groups agrees with the h group on the opposing side of the double bond. naturally this leaves the methyl groups in agreement with each other since the butene group is planar. HOWEVER i am told that the answer is (Z)-2-phenyl-2-butene. for this to work the methyl groups in agreement with each other myst take priority over the phenyl group and that doesnt make sense to me. can anyone explain?
9 more posts in this thread. [Missing image file: 1198766.jpg]
Any one have a pdf of : Quantum Mechanics Vol. 1 by Claude Cohen Tannoudji can't find it on google.

How to calculate heat transfer

26 more posts in this thread. [Missing image file: 1352384744202.jpg]
OK, I am a linguist so I assume I'm rather ignorant in all that has to do with science. There is a question I've been asking myself for a long time though, and I can't find the answer. There is a room. let's assume it's about 5x5x3 meters big, so 75m^3. It's empty, and its temperature is 15 degrees. Now, I bring in one liter of boiling water. 100 degrees. How much does the temperature of the room change? I'd like to learn how this is calculated. This is called heat transfer I think.
1 more posts in this thread. [Missing image file: 1350181814497.jpg]
I read an article a while ago about robot trees researched in india, and then recently (I'd say a year ago max) I read an article about building like 100,000 of these robot trees, wonder if anyone has a link for it?
5 more posts in this thread. [Missing image file: 1307805677054.jpg]
Just how hard is real analysis? I do better than math majors in my basic calculus class because its mostly applications but I cant wrap my head around real analysis at all. It just seems tedious and point less.
7 more posts in this thread. [Missing image file: image.jpg]
Studying for finals sci can any of you help me out with this, how do I relate force time and kinetic energy, I'm just stuck here pic related
12 more posts in this thread. [Missing image file: 1346615793249.jpg]
Please help me guys.I'm in my first semester of electrical engineering. What can i do to just improve overall as a student and get smarter. I slacked off in high school and I'm paying the price.

Millenium Prize Problems

0 more posts in this thread. [Missing image file: RiemannCriticalLine.png]
So /sci/, what's your favourite Millenium Prize Problem, and why is it your favourite? >P vs. NP >Because pooters I really got excited when IP = PSPACE was proved, but sadly that was proved unrelated to P =NP. For the clueless: http://en.wikipedia.org/wiki/Millennium_Prize_Problems
29 more posts in this thread. [Missing image file: jigsawpuzzle.jpg]
Sup /sci/ trying to learn c++ in a week. Tips, tricks, shortcuts? p.s. I hate syntax.
0 more posts in this thread. [Missing image file: Untitled - Copy.jpg]
"A speck of dust in space has the rest mass of 463ug. If it is approaching Earth with a relative speed of 0.100c, what will be its mass as measured in the earth frame of reference?" How can I rearrange to find the relativistic mass?

living in 10 times Earth's gravity.

41 more posts in this thread. [Missing image file: 20090512214648!King_Kai's_planetDBZ.jpg]
I realize how absolutely ridiculous this sounds, considering that somebody weighing 120 lbs would weigh over half a short ton. But, is it theoretically feasible for somebody to slowly work there way up to 10x Earth's gravity? Basically, I'm wondering if the human body, including all of our internal organs and chemical processes, could adapt to the change. And if they could, could going back to normal Earth gravity cause some kind of decompression sickness like if a scuba diver resurfaces from the deep too quickly? Could we even work our way up to 2x Earth's gravity? How much stronger could training in this kind of environment make somebody?

Quick Question

5 more posts in this thread. [Missing image file: chen.png]
Do the identities: e^{ix}+e^{-ix} = \cos(x) and e^{ix}-e^{-ix} = i \sin(x) hold even for complex x? I'm trying to simplify my transfer-matrix-method algorithm, but the argument of the exponents I want to convert into trig functions involves a wavevector which can be complex.
24 more posts in this thread. [Missing image file: HP_2.jpg]
The Fermi Paradox. It basically states that the reason we have not yet been visited by aliens is because civilizations technologically advanced enough to travel here end up destroying themselves before doing so. Discus.
9 more posts in this thread. [Missing image file: moustaches.gif]
So what's the deal with game theory? Why is this all the rage in research right now? Someone I know did their master's thesis on solving an old Chinese game, and I am having a hard time understanding this field's implications on science as a whole. Any thoughts?
3 more posts in this thread. [Missing image file: 1343666820613.jpg]
ITT we pretend business economics is a real science.
18 more posts in this thread. [Missing image file: dangshawty.png]
hi /sci/ i am begging for your help, this might sound stupid or i am brain dead from no sleep but i have no clue how to solve 2 + j1.5i +60<20* = 100<*. in the complex domain where j = root(-1) obviously solving for i or if anyone has a good youtube instructional video that would be very appreciated.
14 more posts in this thread. [Missing image file: mgtstudiesstudent2[1].jpg]
Hello guys. I am studying for my algebra exam, and I have questions about the following old exam problems. 1. Let G = (a,b | a^6 = 1, a^3 = b^2, bab^{-1} = a^{-1}) be a group presentation. Show that the group has order 12. I've found out, after looking around in Hungerfords book, that there is a group satisfying these relations, and it is a subgroup of S_3 \times Z_4 generated by a = ((123), 2), b = ((12), 1). Is there any way of solving this without coming up with this explicit construction? For example, quotient methods or something? 2. Exhibit a prime ideal of Z(\sqrt{-5} such that the ideal contains 7. I have no good ideas here. I've shown that the principal ideal generated by 7 is not prime, because actually 49 is a product of two nonunits out of which neither is divisible by 7, hence that ideal itself is not prime as 49 certainly is contained in (7). Any ideas? >pic related. It is a group presentation.
18 more posts in this thread. [Missing image file: alien land.jpg]
What would be your estimation about an alien lifeform on another planet ? Would it really end up any different from earth beings ? Or is it possible that they end up something completely unpredictable. Focusing for only the ground movements, it would need some kind of bi-directional limb system to move on the ground, or they can squirm like worms. So they will probably grow legs eventually up the evolutionary chain. Also I assume that it would be easier for beings with hands to kill beings with no hands, so handless ones will probably eradicate early, and the wormy ones would die from malnutrition due to their slow speed and being easy preys in general. Since vision is the most useful sense, they would need some kind of photon receptor, assuming their planet is lit. They may not have humans lightwave spectrum, but they would still detect something close to what we detect. The second most important sense would be hearing, so the deaf ones would have less chance to survive without hearing whats going on in their surroundings. So far, I assume that it's a high probability that the being will end up with legs, hands, eyes and ears. What are your thoughts about this subject ?






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