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/sci/ board - Science & Math - May 2014

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Most viewed threads in this category

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http://www.iflscience.com/physics/scientists-create-most-powerful-acoustic-tractor-beam-date
0 posts and 0 image replies omitted. Click to view.
So /sci/ are you excited about... 39 posts and 0 image replies omitted. Click to view.
So /sci/ are you excited about fully immersive virtual reality? When do you think it would become a reality, and what would you want to do in a virtual world?
What's the best way to... 11 posts and 0 image replies omitted. Click to view.
What's the best way to keep track of all of humanity's various space probes? Where they are, what they're doing, what they've accomplished, what they intend to do, etc?
If you're going to read... 21 posts and 0 image replies omitted. Click to view.
If you're going to read this, note that it's waste of your tie. A blog post that I wanted to tell someone, but don't have to courage or the heart to actually tell anyone I know. Don't tell me you haven't been warned, and if you're gonna say something, sage goes in the e-mail field. I always looked at the picture posted as a motivation, and it certainly helped many times. When I didn't feel like studying, but had to, I would look at it, read it, feel guilty of the conditions I actually posses, that are actually given to me, the happy life and all, and start studying. And the motivation would be high for a while, for a day, two or a week, then I'd go back to procrastinating. I just had a realization. It isn't about motivation, it's as straightforward as it seems to be. If I was gonna study, I was gonna study. If I were meant to be highly educated, I wouldn't need to be pushed into it. I wouldn't need to research procrastination every month to know how to fight it, I wouldn't need constant flow of motivational quotes or remembering that I love science. I would know all of that all the time. Newton wasn't beaten into discovery, nor was he ever persuaded into it. No great mind ever was. So, I'm gonna drop out, and do whatever average people do, and watch popsci shows and Vsauce because apparently, that's the only form of science information I enjoy. Thank you for reading /sci/, hope you got something of this post too!
Can someone please... 10 posts and 0 image replies omitted. Click to view.
Can someone please conceptually explain Stokes' Theorem to me? Specifically, I am not too sure what I am finding when I am looking for dS in the surface integral portion of the equation. Is it the vector that is tangential to my surface at all points? Or is it normal to the surface at all points? Or am I completely wrong? Thanks gentlemen.
Why do we start with nothing,... 2 posts and 0 image replies omitted. Click to view.
Why do we start with nothing, why not infinity?
Most experts in psychology... 8 posts and 0 image replies omitted. Click to view.
Most experts in psychology believe that IQ and performance relate to eachother in a linear sense. (175 is to 125, what 125 is to 75 performance wise; a difference of 50 points.) Egalitarian society doesn't like the fact that nature isn't equal. That's why Gladwells "above 120 IQ it doesn't matter" philosophy is the politically correct, but not biologically correct answer. I would like to calculate what the 126-195 IQ range would mean in practice. How do I calculate this? Help me math geniuses of 4chan ;)
>2014>not studying... 2 posts and 0 image replies omitted. Click to view.
>2014 >not studying computer science ISHYGDDT its like you dont want to get a lot of money
Hi /sci/.I really don't... 6 posts and 0 image replies omitted. Click to view.
Hi /sci/. I really don't get a thing: theorem 11.1.6 in those notes. http://www.math.pku.edu.cn/teachers/fanhj/courses/symp-11.pdf Care to help? I don't get how you prove that Lie bracket of that is still a 1,0 type of vector
What is /sci/'s opinion... 44 posts and 0 image replies omitted. Click to view.
What is /sci/'s opinion on hexafluorosilicic acid and all it's derivatives being marketed as a health aid? From what I understand it's quite literally poison, and has very recently been classified as a developmental neurotoxin by The Lancet. I understand that it supposedly possesses remineralisation properties when applied topically to the teeth, but surely negatives of it potentially being absorbed into the blood stream via the gums outweighs any positive it might have on the teeth? And if it's so good for teeth, then what the fuck is up with dental fluorosis?
World based on... 3 posts and 0 image replies omitted. Click to view.
World based on philosophy >slow but steady development toward more rational society >technological means of Classical Antiquity can already be used to create idyllic utopia >inexorable march of hegelian Spirit until the world is ruled in perfect communitarian meritocratic harmony and everyone's a philosopher king and has parties all the time World based on science >IF I MALTHUSIAN IT SOME MORE, WILL THE MALTHUSIAN STOP HAPPENING??? PLEASE >WHAT IF I JUST CREATED BOMBS >THERE ARE NOW SEVERAL THOUSAND PEOPLE ON THIS PLANET WITH ACCESS TO BUTTONS THAT COULD KILL THE ENTIRE HUMAN RACE, DID I DO GOOD? >BTW WE'VE BEEN ABLE TO FEED THE ENTIRE PLANET EVEN WITH ITS OVERPOPULATION 500 TIMES OVER FOR LIKE TWO CENTURIES BUT DECIDED TO JUST LET ONE COUNTRY GET SUPER FAT INSTEAD >OOPS SHIT I MELTED THE OZONE LAYER FUCK >YOU GUYS WANT MORE BOMBS OR WHAT
Why is it so hard for... 12 posts and 0 image replies omitted. Click to view.
Why is it so hard for meteorologists to predict the weather accurately ? We can predict the complexity of the universe, land a person on the moon, etc. But what exactly is it that makes the weather system so complex? And what kind of maths do we need to deal with it

Explain it to me as if I was absolutely retarded...

Explain it to me as if I was... 23 posts and 0 image replies omitted. Click to view.
What exactly does the power spectral density say about a signal? Now I know how to calculate it, but what insight do I gain from this thing?
who is your science-fu? 53 posts and 0 image replies omitted. Click to view.
who is your science-fu?
I recently did an experiment... 4 posts and 0 image replies omitted. Click to view.
I recently did an experiment on circular motion involving swinging a string with a mass attached at its end around a circular path of radius, R. I also varied the length of the string, L and took measurements of the time period, T of a revolution for these varying lengths of L. R was kept constant. Afterwards I plotted a graph of T (y-axis) against L and drew a curve of best fit. I'm just wondering what the gradient of this graph would represent? Pic related
HelloI am a extraterrestrial... 25 posts and 0 image replies omitted. Click to view.
Hello I am a extraterrestrial being I am studying human culture You can ask anything
Could you explain the... 1 posts and 0 image replies omitted. Click to view.
Could you explain the Annihilator Method to me? I'm reading this shit and feeling like a retard.

Help with Excel

Help with Excel 7 posts and 2 image replies omitted. Click to view.
I'm having trouble using Solver in Excel to determine how much to produce of each type of product. I have 6 types of beer (A, B, C, D, E, F) and 3 tanks (2 x 500L tanks + 1 x 1000L tank). The tanks don't necessarily have to be working at full capacity. A and B need to be 2 weeks in the tank(s) C, D, E and F need to be 1 week in the tank(s) Each beer has a monthly demand: A - 1900L B - 400L E - 1900L D - 800L E - 1200L F - 1600L How do I determine the ammount of beer that should be produced? What I want to minimize is the difference between the total demand and the total production with the constraints listed above.
Not only do I think that there... 17 posts and 0 image replies omitted. Click to view.
Not only do I think that there is life on other planets, I think that these intelligent species know of us and even FIGHT over us. Just think about it for a second: The Earth is a planet created from a Supernova remnant, meaning that it contains high amounts of elements heavier than iron such as gold, silver, and other precious metals that are both rare and very valuable for scientific purposes. (So on one hand we are a mining interest) On the other hand, we are a planet within the goldilock's zone around our star, so there are high amounts of liquid water, which is a highly reactive substance both needed for life and many scientific reactions. (Providing interests in chemistry, and again, mining) And then to top it off, complex, intelligent life is thriving on it's surface, with a high chance of eventually reaching out to contact them. (Providing interest in ecology, biology, engineering, any environmentalist alien, and even politics) And if aliens think anything like us, there would be disputes between the mining companies, scientists, ecologists, and politicians of their species (and maybe of other races as well) to determine the fate of this rare planet. And with historical accounts such as the Hamberg UFO battle, (picture provided) and even farther back the accounts of Hindu scripture, there is evidence that points to these disputes leading to outright war. Maybe when we see a UFO in the sky, those are patrols looking out for us, and we've lived this long because at least one alien species doesn't want us to die. This is entirely based on what I see though, so you're free to think different. It's just my simple opinion. (And may be rather cool concept for a sci-fi story or something... I don't know...) Tell me what you guys think.
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