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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.
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..
23 more posts in this thread. [Missing image file: 1352662862002.jpg]
50% of Harvard and MIT students couldn't give the correct answer to the question 'A ball and a bat cost 1 dollar 10 cents. The bat costs 1 dollar more than the ball. How much does the ball cost?'
3 more posts in this thread. [Missing image file: ref7pic[1].jpg]
yo sci, I'm currently studying molecular biology and going to double major for applied mathematics. The only thing that's bugging me is that I want to go into quantitative biological systems, but my prospect of calculus is weak. I'm able to work with simple functions, but the idea of tanh(e^x) are still bugging me. I'm not exactly strong at trigonometric differentials and recognizing their inverses either. basically- what are the mathematical necessities of quantitative biology? I'm excellent at statistics and linear analysis, not exactly an Isaac Barrow, can't do calculus proofs to save my life. I have medicine as a back-up plan, but I'm more interested in engaging in pharmaceuticals and whatnot.
3 more posts in this thread. [Missing image file: mprender[1].php_stringid=1108.png]
Anyone here who could help me with this ?
6 more posts in this thread. [Missing image file: ITER-fusion-reactor.jpg]
Hi /sci/, I a couple of questions about fusion reaction/reactors. In general I'd like to ask, just how safe it is and how radioactive it can be, but I have no idea if that can be answered easily or not. But I read somewhere that it can induce radioactivity and radiation-weakening in surrounding materials, but how? And how much of a danger is that to human operators? And lastly, are there any complications of shutting them down, like how fission reactors keep generating heat from beta-decay? Any help is appreciated.
11 more posts in this thread. [Missing image file: dawgz.jpg]
I know homework doesn't go here but could anyone help? (x-1)(x^2 + 5x + 6) = 0
26 more posts in this thread. [Missing image file: 1352741763343[1].jpg]
Can you guys explain to me how that door got blown away but the rest of the house remain undamaged? I'm genuinely interested.
1 more posts in this thread. [Missing image file: 1345681590478.gif]
Any GREbros waiting for scores?
2 more posts in this thread. [Missing image file: KJ1M5.gif]
So the weirdest thing happened last night and I was hoping you guys could tell me what the hell was going on... I went to sleep sober but woke up about three hours later, and when I opened my eyes I had severe double vision, severe as in the room was spiraling violently to such a degree that it was nigh impossible to make out the largest objects in my room. This was causing rather terrible nausea so I held my eyes shut for a minute or so and when I opened them again the room was still spinning but not as greatly. After a few minutes it had all but completely subsided. I went back to sleep and woke up hours later just fine. It should also be noted that just before I awoke to this frightening incident, in my dream (I have no idea what was going on) I felt a sudden rise of panic and adrenaline, so of course my heart was racing when I woke up. To my knowledge, I'm not ill nor have I eaten anything bizarre or foul recently.
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.
22 more posts in this thread. [Missing image file: conte-graphic.jpg]
Anyone here study data mining? What's it like?
21 more posts in this thread. [Missing image file: Weighing-Scales-1.jpg]
A person stands on a bathroom scale in an elevator. The scare reads only 0.75 (i.e., 75%) of the person’s regular weight. Calculate the acceleration of the elevator and find the direction of acceleration. I thought it'd be: F * 0.75 = W m * a * 0.75 = m * g But that's not right. Not a homework question, I have the answer right here. But I can't work out how they got it... Help?
29 more posts in this thread. [Missing image file: 1329175327452.jpg]
Ok /sci/ Seeing as how the prices of gas are not going down in the near future, and its looking bio fuels are going to be our only hope, what is the most realistic bio fuel? I've heard of algae based fuel that is actually 4% more efficient than the gasoline we currently use, and that it would only use .42 % of America's land to grow enough to fuel all of America. They are already making this fuel, it's being funded by people like Bill Gates, but what do you think it would take to get government funding? It would create jobs because the maintenance needed to take care of the algae farms and people who have to convert it. Also in another form of fuel we have fracking, where they break into the shale and blast it with explosives to release gas. Is this a dangerous practice? I've heard that the practice of extracting it is dangerous because of the liquid used in the drilling is toxic and seeps into the well water that some people use. Does this also pose a threat to earth because they are blowing out a land under the crust? Tl;dr alternative energy from Algae and fracking picture unrelated
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?
25 more posts in this thread. [Missing image file: 2b.jpg]
hey /sci/, what do you think of the questions raised by this cartoon? http://www.youtube.com/watch?v=pdxucpPq6Lc
16 more posts in this thread. [Missing image file: 1280749847780.gif]
Why do I like the smell of my own ass so much, /sci/? Genuine question. It is the most complex, rich, fragrant, indulgent aroma I've ever experienced.
10 more posts in this thread. [Missing image file: 4088906401p.jpg]
Hello /sci/, I have what I think is an interesting predicament for you. I use a lot of single packet drink mixes. Teas, lemonade etc, all sugar free. The FDA no doubt reviews these, at least I'd assume they do, however my question revolves around the dust/powder which is breathed in while pouring these mixes. Bear with me. Tube mixes, every one I've tried, without fail, leads to a cloud of mix floating up into the air. I immediately smell and taste it, along with seeing it, and so it's obvious to me I'm breathing in the mix itself. My question is this. For the top brand US drink mix tube/packets, does the FDA actually test the risks of breathing it in from the pour, and if they don't, what do you think the health implications are from breathing in sugar free drink mix clouds if you use them often? Most of my are splenda based, for some are aspartame. Many contain citric acid or another taste acid and vitamin C. Pic related, one of the brands I use, which like every other produces a cloud of dust when poured which makes you smell and taste the drink mix and is thus inhaled.
37 more posts in this thread. [Missing image file: 1352322221123.jpg]
/sci/, I need your help. I've been going cold turkey on coffee. I used to drink about 5-6 cups per day. The average amount of caffeine per cup being 200mg (it's a pretty strong coffee and I drink it black). I decided to stop drinking coffee because I was getting anxiety attacks, depressed, heart aches, etc. I was even wrongfully diagnosed with adult ADHD because I was so energetic during my visit to a neurologist. Anywho, I'm in day 2 now and the withdrawal symptoms are painful as hell : light feels like a knife in my brain , brainfogged, no energy/motivation to do anything, etc. Does anyone know how to temper the withdrawal effects? I know I should have gradually stopped but I just wanted that shit out of my system immediately.


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

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