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/sci/ Science & Math

Threads added between 2012/11/07 and 2012/11/14

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Most viewed threads in this category

4 more posts in this thread. [Missing image file: lewis.gif]
How would I draw lewis structure of [NO4]3-, with the lone pair electrons, and with the formal charges minimized? NO4 3- Have been stuck on this question for over an hour.
3 more posts in this thread. [Missing image file: 163013_10150113788417629_689802628_(...).jpg]
Why does poop occasionally smell like sewage? Bacteria? Which products in particular are responsible for this smell? On the topic of smelling, what makes playdough smell the way it does? I recently got a copy of XCOM and it smelled just like it. I never had a game smell like that before.
12 more posts in this thread. [Missing image file: woof.jpg]
Calculate the mass of H2O required to react completely with 5.0 g of SiCl4: SiCl4 + 2H2O -> SiO2 + 4HCl I saw this problem online and the answer is given, but not the steps. Anyone wanna show the steps? Here is another one which seems slightly harder, well only harder because I don't know where to start. Lead (IV) oxide reacts with concentrated hydrochloric acid as follows: PbO2(s) + 4HCl(aq) -> PbCl2(s) + Cl2(g) + 2H2O(l) What mass of lead chloride would be obtained from 37.2g of PbO2, and what mass of chlorine gas would be produced?


22 more posts in this thread. [Missing image file: latex.png]
good evening /sci/ i want to be able to make gorgeous latex, but after a few google searches my question remains unanswered... how the fuck do i begin a latex code here? is it \ documentclass {article} \ begin {document} (without the spages after the forwardslash, of course) any help in the matter of leaving the pleb tier of latex coding would be appreciated
53 more posts in this thread. [Missing image file: tyson[1].jpg]
Does Neil Degrasse Tyson owe his success to Affirmative Action? Has he even done much for science? He strikes me as a guy who can make himself appear much smarter than he actually is by speaking eloquently and using sophisticated vocabulary. When I watch videos of him he's usually talking about some relatively simple scientific (or other) concept that even a non-science person (such as myself) can easily understand, but he makes it seem like he's really smart for knowing it. I think the media is just touting him as some extraordinary genius because he's black. As if to say, "See? Blacks are just as capable as whites!" Or to give blacks a scientific figure that they can flaunt in front of whites and say "what now, whitey? We scientist now." Just like how blacks often rub Obama in the face of whites as a way to say that they're in control now. He reminds me a lot of his mentor Sagan i.e. a good speaker w/ a moderate understanding of science, but with very little new things to add. A lot of my peers and people online seem to think Sagan is among the smartest men in history, but I've personally always felt he was extremely overrated. I hope I'm not alone in that opinion. I just can't help but think Sagan would be almost unknown today if he hadn't made Cosmos or whored himself out to the media like he did. I don't browse /sci/ much and I've never seen threads about Tyson or Sagan. I just wanted to get your opinions. Forgive me if it's already been asked.
42 more posts in this thread. [Missing image file: 1351274632779.jpg]
Is there evolutionary reasons that causes fetishes like feet fetish?
12 more posts in this thread. [Missing image file: radial.png]
Quantum Physics: I'm trying to figure out why my radial wavefunctions aren't orthonormal. See pic. I defined the wavefunctions for R2,0 and R2,1, and attached literature for comparison. This is for Hydrogen and I'm using atomic units, so Z and A0 = 1. I'm pretty sure the functions I wrote in mathematica are correct. I know that <Rnl l Rnl > = 1 if they're the same Rnl, and 0 if not. My normal is working, but my ortho isn't, as you can see in the pic. I also know that because there are in spherical coordinates, you are integrating r^2 dr, which is why I have those extra r's in the integral. Actually, anyone who can help me probably would understand that. Also the functions are real valued so the complex conjugate doesn't matter. What am I missing?
13 more posts in this thread. [Missing image file: 1325622231807.jpg]
Alright, /sci/, I've decided I want to master mental arithmetic. That is, I want to be able to do rapid arithmetic operations in head (addition and multiplication, and possibly some powers, of integers and rational numbers). I am a math major, but this is mostly just a private interest of mine. Has anyone on here tried this? Any tips or links? Pic unrelated
27 more posts in this thread. [Missing image file: The_ocean_by_xipx.jpg]
How many gallons are in an inch of the ocean?
12 more posts in this thread. [Missing image file: ISIS-space.jpg]
Should I change my major from CS to physics? I'm interested in both equally but programming isn't that fun for me. Is it true that a bachelor's in physics is pretty much useless? Do any of you guys have one and what did you do with it?
6 more posts in this thread. [Missing image file: 1323677310952.png]
A water hose placed on the ground shoots water at a speed of 6.5 m/s. At what angle from the ground should the nozzle point in order that the water land 2 m away? My answer: > 81 degrees cosX=adj/hyp X=cos^-1(6.5/1) X=81 degrees Their answer: 13.82 degrees Where did I go wrong?
0 more posts in this thread. [Missing image file: r3HHs.jpg]
Hey /sci/, Anyone here ever done GSOC? I'm trying to get a jump start on coming up with a project for next year, and would be interested in hearing anyone's experiences with the program. Err, pic not related.
15 more posts in this thread. [Missing image file: 1352425779228.jpg]
Wait wait wait wait wait Wait. Everyone hold onto their butts. What is this I am reading about LFTRs? Are you telling me we have access to essentially free energy? Why am I not flying in jetpacks and traveling the world for free in electric any vehicle ever in my perfect utopia? I'm here in my boxers on fucking 4chan and there is free energy out there why does my state/country/planet/nearby solar colonies not run on this? 5 years ago?
145 more posts in this thread. [Missing image file: sandwich.png]


3 more posts in this thread. [Missing image file: tech-desktop-backgrounds-4.jpg]
I'm sure this has already been done, but what is 0/0? I personally think that it can equal any real number, but some people would say it's 1 or 0 ect. Pic unrelated

Black holes

16 more posts in this thread. [Missing image file: hole.png]
Hey /sci/, Layman here, What do you suppose were to happen if a black hole came into contact with another black hole?
6 more posts in this thread. [Missing image file: top-10-james-bond-movies_flash.jpg]
James Bond has a 1st in oriental languages he got from Cambridge in stead of STEM. Would you tell James Bond he has a useless degree?
22 more posts in this thread. [Missing image file: 2nd Grade Math.png]
EXAMPLE: 1000 - 23 I forgot all my math from before 2nd grade. Show me how to solve. I know the answer, but I need to know how to solve by hand. Why is life so hard?
5 more posts in this thread. [Missing image file: Coulomb.jpg]
Hi, I have a math question for you. Cant understand how to begin to solve this.. ''Electrolysis of aluminum takes 40 million coulombs to draw out 3.7kg Al. What must the current be to do it in A one minute and B one hour?'' Is this question impossible to solve due to lack of other factors?? it is a total mindfuck for me. I know that 1c = 1 ampere per second.. Can anyone please help?
11 more posts in this thread. [Missing image file: 3-1213191960-me-thinking-hard-about(...).jpg]
Hi /sci/ (picture not related) So i was thinking how many amazing things one simple cell can do with some time. But then a question poped out in my head. Were did the first cell come from? anyone got a clue?

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