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/sci/ Science & Math

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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?
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
16 more posts in this thread. [Missing image file: halloweenmemescostumes.jpg]
Please simplify this for me (no wolfram alpha answers, i tried): 12 + 2(16 - 22)2 – 32(17 – 3·4)
34 more posts in this thread. [Missing image file: 1347358708891.jpg]
Why does the derivative of floor(x) look like this: http://www.wolframalpha.com/input/?i=derivative+of+floor%28x%29
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.
3 more posts in this thread. [Missing image file: 1349437231329.jpg]
A factory produces plate glass with a mean thickness of mu = 4mm and a standard deviation of sigma = 1.1 mm. For quality control, a simple random sample of n = 100 sheets of glass is to be measured, and the sample mean thickness (i.e., x-bar) of the 100 sheets is to be computed. The Central Limit Theorem Question: For the factory described above, what is the probability that the average thickness, x-bar, of the 100 sheets of glass is less than 4.1 mm? That is, find P(x-bar< 4.1). 0.3183 0.5362 0.9091 0.8186 0.1814
42 more posts in this thread. [Missing image file: 1351274632779.jpg]
Is there evolutionary reasons that causes fetishes like feet fetish?

Ebook help

4 more posts in this thread. [Missing image file: p1010265c.jpg]
Hoping someone could help with an ebook search. I'm looking for Chemistry 6th Ed. by Zumdahl/Zumdahl and none of the sites posted in the sticky are coming up with it. If anyone has it that would be appreciated.
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
3 more posts in this thread. [Missing image file: hodge twins.gif]
Anyone know where I can get Minitab 16 for free? Will pay with compliments
11 more posts in this thread. [Missing image file: 1350605636189.png]
>Premeds Get out of my biology class, premed scum. >Will this be on the test? >Do we have to know this?
14 more posts in this thread. [Missing image file: DescartesCartoon.jpg]
Should I major in physics?
101 more posts in this thread. [Missing image file: zizek4.jpg]
Favorite philosopher? Pic related.
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.
8 more posts in this thread. [Missing image file: aristotle1.jpg]
/sci/, I need some help. Next semester I'm going to be taking a Math course, Calculus course, and physics course. The thing is that I suck at math, and I don't even know what calculus is. Can anyone give me some advice on how to learn this, I have to get at least 85% in these three classes. Looking for some info on the most basic calculus you can think of. In Math we're going to be learning: Trigonometry Relations and Functions, Permutations, Combinations and Binomial Theorem In physics we're going to be learning: Momentum and Impulse, Electric Forces and Fields, Magnetic Forces and Fields, Electromagnetic Radiation, Atomic Structure, Atomic Nucleus I really don't know anything about these, and I can use all the help I can get. I don't want to live the rest of my life as a pleb. I'm going into engineering next year if anyone was wondering, and can give me any information that would help me out with that.
3 more posts in this thread. [Missing image file: 1346906197639.gif]
I need to calculate a residue for log(z-ia) at z=ia and don't know how to do it. I figure I could do an expansion around the point but don't know a simple way to calculate the coefficients. Is there a simple way to determine A, B, C, ... in log(z-ia) = A + B/(z-ia) + C/(z-ia)^2+ ... A & B probably are enough. Pic sort of how I feel.
6 more posts in this thread. [Missing image file: 1322852947627.jpg]
What is the most common insult used on this board?
51 more posts in this thread. [Missing image file: wtc-911.jpg]
I've been reading the 9/11 wiki, it's fascinating, especially to learn how the people died. I've been thinking, it says here "More than 90% of the workers and visitors who died in the towers had been at or above the points of impact.[37] The destruction of all three staircases in the tower when Flight 11 hit made it impossible for anyone above the impact zone to escape." If hitting the staircases prevented people above from evacuating, why didn't the terrorists strike lower parts of the buildings? Keep in mind that the twin towers had 10,000-15,000 people in them when the planes hit and only 2500 or so actually died. TLDR; could the 9/11 attacks have been more effective and killed more?

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