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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?
1 more posts in this thread. [Missing image file: 1346147807239.jpg]
Given: The Moment Generating Function of X is M(t)=(e^5t - e^4t) / t, t=/=0 and the M(0)=1 Want to find: P(4.2 < X <= 4.7) What method do I need to use to find this?
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.
23 more posts in this thread. [Missing image file: first_world_problems.jpg]
Is Depression actually real, or just the result of whiny people feeling sorry for themselves? Does the "victim mentality" pervasive in our society just prolong the depression? How many depressed people are actually just whiny entitled faggots who feel like the world "ripped them off"? Is depression just the result of jewish propaganda?
2 more posts in this thread. [Missing image file: Dr Kleiner--article_image.jpg]
Let's see. The massless field-flux should self-limit and I've clamped the manifold parameters to CY [1] base and LG [2]? orbifold [3], Hilbert inclusive [4]. Conditions could hardly be more ideal. [1] http://en.wikipedia.org/wiki/Calabi–Yau_manifold [2] http://en.wikipedia.org/wiki/Orbifold [3] http://en.wikipedia.org/wiki/Ginzburg–Landau_theory [4] http://en.wikipedia.org/wiki/Hilbert_space
304 more posts in this thread. [Missing image file: Consciousness.jpg]
Does anyone here study neuroscience? Any neuroscience researchers or professors? Would you care to share some of your educational or professional experiences/knowledge? I'm considering the field..

Math

39 more posts in this thread. [Missing image file: 2+2.jpg]
Ask me any math question, gonna do my best to answer ITT : OP does your homework
7 more posts in this thread. [Missing image file: Penguins.jpg]
Subject of the thread is simple; Share the websites you use to download ebooks. Discover new cool websites to find what you want and share websites that you think deserve more "fame". I'll start: en.bookfi.org It's got a huge library and is based in Russia.
47 more posts in this thread. [Missing image file: 1305601987626.jpg]
>2012 >Not studying engineering Why are you "hardscience"fags destroying your life?
9 more posts in this thread. [Missing image file: Frys#6692174.gif]
How many nonmetal atoms are present in a 3.50 x 10–4 mole sample of potassium bicarbonate? What is the mass in grams of 1.15 mol of strontium sulfate? Make sure to use atomic weight values from the periodic table in your workbook when answering this question. Report your answer in grams with the correct number of significant figures. Which are true? A. strontium nitrate and calcium carbonate are soluble salts B. barium fluoride and lithium chloride are soluble salts C. barium nitrate and sodium phosphate are soluble salts D. copper (II) iodide and ammonium acetate are soluble salts E. silver bromide and calcium acetate are insoluble salts F. nickel (II) bicarbonate and lead (II) sulfate are insoluble salts G. barium bromide and barium sulfate are insoluble salts H. aluminum carbonate and silver iodide are insoluble salts

Help.

4 more posts in this thread. [Missing image file: WhatisthisIdon'teven.jpg]
Okay, /sci/ I need you to solve my problem. I play TF2, and a friend of mine, who had stopped playing it a few years ago. He also had loads of stranges/hats/etc. He decided that since he'll probably never play again, he gave me his "password" to his account. And by password, I mean some dipshit code he made 'cause he's a faggot. You guys have sources, you can help solve it. The code is as follows: Q V C O Z L U M L P M D H L O S D C C H V W A R K U Q O E R H D K E A Z Z E R S S T N Z T U G K U W X L I T Z Y Q N H D D R V O. What does this shit even mean?
3 more posts in this thread. [Missing image file: pepsi.gif]
Rain is falling steadily, but there is no wind. You are on a bus that moves at 25.0 km/hr, and you see that the rain appears to be falling at an angle of 38o with respect to the vertical. What is the vertical velocity of the rain drops? Does anyone here know how to do this shit? I've been trying for a while using trigonometric properties and also vector quantities. I would greatly appreciate your help /sci/
15 more posts in this thread. [Missing image file: 45252[1].jpg]
I have an interest in science, especially physics research, but unfortunately haven't been keeping current lately. I would love to know whether /sci can confirm a couple things for me. Has the LHC @ cern the required components to confirm whether the graviton exist. Are there any other ongoing projects that will be working towards that at the moment or in the near future? While we are on the topic of high energy physics; would we be able to start studying and messing about with exotic particles (SS particles etc) anytime soon at the same level as we are currently doing with antimatter at the moment. Don't really feel like waiting a century or so before we start powering up our first warp drives.
7 more posts in this thread. [Missing image file: 69505_371393096274337_746709210_n.jpg]
suppose V and W are vector spaces (v_1, ... , v_m) is a basis for V Prove that the linear transformation T from V to W is invertible if and only if ( T(v_1), ... T(v_m) ) is a basis for W

Gibbs triangle

0 more posts in this thread. [Missing image file: gibbs triangle.jpg]
Request for ya, I need photo of Gibbs triangle where are 2-propanol + toluene + water. Could you help?
2 more posts in this thread. [Missing image file: download.jpg]
My girlfriend is going crazy with this accounting question, please help. Scare-2-B-U (S2BU) specializes in costumes for all occasions. The average price of each of its costumes is $160. For each occasion, S2BU receives a 20 percent deposit two months before the occasion, 50 percent the month before, and the remainder on the day the costume is delivered. Based on information at hand, managers at S2BU expect to make costumes for the following number of occasions during the coming months: April-75 May-45 June-30 July-60 August-75 September-165
1 more posts in this thread. [Missing image file: Math.jpg]
Hola, /sci/, can you help me out? For a sphere of radius R and with a solid angle omega, I know that integral of (R^2)/4 d(omega) = pi*R^2 But why is this? What limits do you take? Is it something to do with the surface area of a sphere being 4*pi*R^2? Thanks.
5 more posts in this thread. [Missing image file: 1343490900614.jpg]
So I'm working with implicit differentiation and trying to figure this problem out. Original curve is (xy^2)-((x^3)y)=6. Given dy/dx=(((3x^2)y)-y^2)/(2xy-x^3) find the x-coordinate of each point on the curve where the tangent line is vertical. Now I know that would be when the denominator (2xy-x^3) equals 0, but that would be an infinite number of points on the curve y=(x^2)/2. Is there something I'm missing? If not, how am I supposed to format the answer? I am aware this is babby shit, but I'm very confused with this question.






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