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/sci/ Science & Math

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Most viewed threads in this category

11 more posts in this thread. [Missing image file: 1360786723286.jpg]
I've occasionally used this homemade lube recipe I found for masturbation, and I'd like to know if it would be safe for anal (internal) use. it consists of cornstarch and water.
2 more posts in this thread. [Missing image file: 1348436701203.jpg]
>Cant even multiply divide add or subtract fractions >Don't know what an exponent is >Last math class was geometry back in 11th grade where i got a D >Go to /sci/ and ask 'How do i math?" >Go to khanacademy faggot >Do it >now I'm blasting through precalculus Just wanted to stop by and say thanks.
17 more posts in this thread. [Missing image file: 1353520551211.jpg]
Why do scientists have such a pattern bias? They try to find reason and order in chaotic things. They always try to quantify things and come up with false conclusions. Yellowstone national park has erupted every 640,000 years or so therefore it will erupt soon because it's been 640,000 years since the last eruption. That's fucking stupid. You have a sample size of THREE past eruptions and they happen to be roughly the same distance apart so you assume that it's a linear event? Moron. Same with economists and inflation. They think inflation is something that will creep up on a linear scale and that we'll see it coming despite the fact that that has NEVER happened. Inflation randomly hits one month and no one knows why. Even Milton Friedman, a nobel prize winning economist said no one truly understands monetary inflation because it's a random event, yet people always try to see it coming with bullshit guages like consumer price index. What's with academics and trying to find patterns in every thing?

Just a thought...

2 more posts in this thread. [Missing image file: chernobly.jpg]
http://englishrussia.com/2006/09/13/lost-city-of-chernobyl/ This is a PERFECT reason to get that helicopter with a camera. Imagine being able to fly around like 10 minutes at the cost of I don't know, like 6 to 8 hours per charge? Adding it up is about 48,000 for craft/cam (us shipping, vs continental shipping) Their gov. should do 1 for science
1 more posts in this thread. [Missing image file: believe.jpg]
11 more posts in this thread. [Missing image file: Mathematical_equations.jpg]
OK /sci/, all along I thought it was just a joke, troll, myth, etc. However, I just learned that my current Math professor, hired in 2010, makes $300,000. Is this real life or just his luck?

Civil Engineering

2 more posts in this thread. [Missing image file: eng3.jpg]
Any Civil Engineers wanting to test their skill (do my homework)


4 more posts in this thread. [Missing image file: Moon-Phases01.jpg]
If the moon were twice the volume but mass equivalent to Saturn's moon Titan, what kind of changes would we see in how it affects Earth? Would it: a) Have a closer orbit? b) Appear larger in the sky? c) Have a reduced effect on the tides? d) All of the above? e) None of the above? f) a and b? g) Other (please explain)? For quick reference, the density of the moon is 3.3464g/cubic cm. Compared with the planet Earth (5.515g/cubic cm) and the moon Titan (1.8798g/cubic cm). This question has been bothering me... I hated physics in high school and I understand only enough of the forces at play to posit the question in a vaguely intelligent manner.


11 more posts in this thread. [Missing image file: humans-and-dinos-coexisted-law.jpg]
Proposed Law Would Make It Illegal To Fail Students For Arguing Dinos And Humans Coexisted
0 more posts in this thread. [Missing image file: led-diagram1.jpg]
Hey /sci/, I'm trying to setup a LED circuit but I'm an electronics noob. What I have is three LEDs, each rated at 1.5v forward. I want to run them at 50mA. For power I want to use 1.5v AA batteries and have as long of battery life as possible. I've figured that if I run them in series I cam maximize battery life. My problem is I think I understand Ohm's law (V=I*R) but I'm clueless as how to handle it if V is zero. To run them in series I need three AA's at 4.5v. If the forward voltage is 1.5 each the net is 0v. Am I just an idiot and unaware you can't run a circuit in this fashion? The alternative is to run two LED's on one leg and a single LED on another with two separate resistors but this would double my current draw. Or I could run three separate legs tripping my draw which I really don't want to do. TL;DR Three 1.5fV LED's at 50mA. 4.5v battery source. What do for resistor?

Pure brain masturbation

0 more posts in this thread. [Missing image file: 2012-DA14-vs-GEO-580x434.jpg]
Hey, /sci/, just curious, does anyone know what the mass of 2012 DA14 was, and how much delta-v would've been needed to capture it into a circular orbit at its perigee?
9 more posts in this thread. [Missing image file: yWggUFN.jpg]
Exam in 9 hours. Anyone have any magic tips for learning PDEs?


9 more posts in this thread. [Missing image file: 1301076694358.jpg]
I'm not sure if this is the best place to post this but something's been on my mind recently so I figured that I might as well give it a go. You hear that gravity affects time, like the greater the gravity the slower time flows but that's just because the particles are more affected by the gravitational pull and so operate slower. It's not like it has anything to do with a thing like time. To begin with the human concept of time doesn't really seem like an actual thing. The only thing that exists is the world following the rules of nature right now. To put it simply time usually imagined as a video record, it has a start and an end you are somewhere in-between where the video is at and you theoritically are able to go to any point back or forward between start and finish. While in reality it's like an unrecorded livestream and the only thing that "is" is what plays at the moment. Am I just dabbling over something obvious or is there something that I'm overlooking and proves it wrong to begin with?
1 more posts in this thread. [Missing image file: num.png]
Hello, /sci/ Like the pic says, I'm terrible at number theory, and so have no idea how to get this done: Prove that for all n >= 2, if p = 2^n +1 is prime, then 3 is a primitive root modulo p. Could you give me some pointers on how to tackle this?

Milky way

10 more posts in this thread. [Missing image file: milky-way-2.jpg]
Okay, so I cant work out a solution and everything online points to that either i'm not asking properly or that nobody has asked properly... So we've got 2 arms in our galaxy and when we loo up at the night sky we see *view img* So how and why do we never see the other arm on the other side of us as we are theoretically not on the outmost tip of the galaxy?

OC thread.

4 more posts in this thread. [Missing image file: meme explotaible.png]
I hope /sci/ has a sense of humor. I did this exploitable. OC thread.


7 more posts in this thread. [Missing image file: 800px-Möbius_strip.jpg]
We say that every preimage of an open set is open. Now I think its not true: We can define a function e^x so that x belongs to R (real numbers). Now its image is an open set ]0,inf[, still the preimage, set R, is closed in itseld, R. So we have concluded that pre-image of open set ]o,inf[ is closed. So whats da heck wrong with my logic? Please help stupid, exam tomorrow.
28 more posts in this thread. [Missing image file: conundrum.png]
What is the answer?

Lie detection?

0 more posts in this thread. [Missing image file: ImageCache.png]
0 more posts in this thread. [Missing image file: 1266529642972.jpg]
hey setti

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