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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/?

Global Warming/ Climate Change is it real?

28 more posts in this thread. [Missing image file: global-warming-1.jpg]
Take a position and back it up with science
17 more posts in this thread. [Missing image file: SatelliteOnly[1].jpg]
Sup /sci/ I'd appreciate some wisdom about now. 150 kg satellite is in a circular orbit 100 km above the earth. After 1000 revolutions it has descended by 8 km. Calculate the magnitude of the friction force. This question should be solved using E = mv^2/2 - GMm/r Where m is the satellite mass and M is earth's mass, r is the orbital radius, and v is the satellite's velocity.
4 more posts in this thread. [Missing image file: 20121210183429791.jpg]
Help me, I'm stupid. Can you explain how I apply Hückel's rule for, lets say molecule c? I understand how the "first" Nitrogen atom is sp2 hybridized and has one electron on p-obirtal that makes a pi-bond, but what about the other nitrogen atom? Does the lone pair contribute to delocalization now instead of the pi-bond? How do I calculate Hückel's rule in this one?
29 more posts in this thread. [Missing image file: 2quoq5y.jpg]
How many hours do you study per day? Any tips to get smarter? There is SO MUCH FUCKING SHIT TO LEARN. >tfw learning science, politics, psychology, math, etc and I don't even attend school, post college here. I hope brain drugs advance enough that there are no side effects.
4 more posts in this thread. [Missing image file: plato.jpg]
Science is subjective and published articles for journals should contain an extra cover note consisting of; the reasoning behind the review, current state of mind, etc. Discuss.

Any MATLAB experts out there?

5 more posts in this thread. [Missing image file: think_your_smart_do_you.jpg]
I am studying for my MATLAB final and I came across an interesting question that I don't know how to go about solving. Anyone have any pointers to nudge me in the right direction?
15 more posts in this thread. [Missing image file: feel.jpg]
>"The proof of which is trivial, and left as an exercise to the reader"
130 more posts in this thread. [Missing image file: maths-isnt-everyrhing.jpg]
I want to like math but I don't see the philosophical ramifications behind it. Other than set theory which has a few neat conclusions about truth values and knowledge. What is interesting in math in a big sense? Seems like only set theory is, everything else is just a tool for engineers.
21 more posts in this thread. [Missing image file: Growing_earth.gif]
Why isn't this ridiculous theory more popular than ...
23 more posts in this thread. [Missing image file: CodeCogsEqn.png]
A question on a technicality: Considering that the limit does not necessarily equal the actual value, how do i prove this equation? \lim_{n \to \infty}\sum_{i=1}^{n}x_i = \sum_{\forall i \in \mathbb{N}}x_i
13 more posts in this thread. [Missing image file: 1317726126787.jpg]
/sci/ I need some of you chem bros to tutor me First. How would I go about making Anhydrous ammonia safely? Also, how do I get HI? And how pure is RP in matches? Can you get it at a chemical store or some shit easier? Also can someone describe an acetone/toluene wash to me. And a recrystallization. I've only taken General chemistry. I got a B though. A in lab. I need to know all these things.
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.
2 more posts in this thread. [Missing image file: 1.jpg]
Hey there /sci/ I need your help: I need to find the saturation region, the cut off region, the active region as well as the amplification factor (beta) using Pspice. I know where those are in the graph, but I somehow need to have them marked out in the program (if that's possible) so that I can print screen them. What do??
8 more posts in this thread. [Missing image file: 1349748514169.jpg]
/sci/, how does this work: I read somewhere that the stealthily modified Sikorsky UH-60 Black Hawk Helicopter used to roll on Osama, was designed so well that it emits no electromagnetic radiation... What is happening there? >If visible light falls somewhere on the electromagnetic spectrum... does this mean that the copter is invisible? Are heat and sound waves within this spectrum? Love, /fit/
7 more posts in this thread. [Missing image file: 741thermo.gif]
electronics newfag here, I'm planning to make this thermostat found here: http://www.craig.copperleife.com/tech/thermo/ I was wondering which relay I should buy. The guy from the site bought this one: http://www1.jaycar.com.au/productView.asp?ID=SY4062&CATID=&keywords=SY4062&SPECIAL=& form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMa x=&SUBCATID= anyone know a relay like this on ebay? It needs to work on european mains 220V

Confidence Intervals

10 more posts in this thread. [Missing image file: 285142_485774804776869_931993389_n.jpg]
Hey /sci/, I'd love some statistics help if anyone feels up to it. Problem: A company tested 100 widgets and found that the average breaking strength among the 100 tested was 250 psi with a standard deviation of 50 psi. How confident could this company be when making a prediction that all widgets manufactured will have an average breaking strength between 247.5 psi and 252.5 psi? Having trouble getting started on this and cant find the notes from my last class. I know you start by finding the standard deviation of the sample mean (turns out 5), but I'm not sure how I could use the sample mean or where to go from there.
6 more posts in this thread. [Missing image file: 1344205712180.jpg]
Why is calcium's 2nd ionization energy higher than its first? Wouldn't removing a 2nd electron require less energy since it would result in a full p orbital which would be stable?
8 more posts in this thread. [Missing image file: scion-iq1[1].jpg]
What's /sci/'s take on IQ? I've got myself tested today as part of a psychiatric evaluation before beginning a therapy surrounding social anxiety, and my doctor placed me in the upper 130's. Now I'm sorta dazzled about myself because it's in such stark contrast to my resumee, because I'm 24 and have achieved nothing in life apart from a half assed highschool degree. Also, is anyone here a Mensa member, and can you tell me if the membership comes with any benefits other than a feeling of elitist smugness?

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