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/sci/ Science & Math

Threads added between 2013/02/27 and 2013/03/06

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Most viewed threads in this category

13 more posts in this thread. [Missing image file: Fphoto-44349803D-2RM[1].jpg]
dear /sci/ why the FUCK is my 10 molarity HCl turning fucking yellow? it's clear then i pour it into glassware and it turns yellow. my equipment is fucking clean. what the fuck is going on? is the HCl being oxidized producing chlorine? pic semi related. not that yellow, but fairly yellow.
8 more posts in this thread. [Missing image file: map00190.png]
Hey, /sci/. I've got a Bio 101 short essay question that is killing me and taking up time that I could be using more productively for other schoolwork. If you guys could help me out with this within the next 3-4 hours, I would be extremely grateful. Hell, I wouldn't mind giving $5-13 via PayPal to whoever could first take the time to arrange a good answer (close to 100 words). Here it is: Explain how oxidative phosphorylation is an example of how new properties emerge at each level of the biological hierarchy.
7 more posts in this thread. [Missing image file: algebraic-graph-theory-c-d-godsil-p(...).jpg]
Anyone have a PDF of Algebraic Graph Theory by Godsil and Royle? I need it to study for the upcoming USAMO.
0 more posts in this thread. [Missing image file: Linear-Algebra-Poole-David-9780538735452.jpg]
does anybody have a pdf of Linear Algebra Modern Introduction 3rd Edition by Poole? I've been looking everywhere and can't find one

black holes

7 more posts in this thread. [Missing image file: url.jpg]
Hey /sci/, i was wondering if u could tell me if in theory i was to stand in the middle of a black hole and hold a flash light, would i see the light? me and my friend were talking about this and i came up with that if i point it at me i would see it but not if i pointed it out and i would see the light of everything outside the black hole
14 more posts in this thread. [Missing image file: Lighthouse.jpg]
Hi everyone. I'm 18 years old, and I started getting episodes of insomnia in early January (I was 17 at the time, my birthday is in February) and in February it developed into something more persistent. I tried diphenhydramine as well as melatonin and nothing seems to be helping me. I feel deprived of motivation, no libido, and dumber than ever before. It is now March, and although the insomnia has been somewhat alleviated, I still don't get enough sleep during the night. I have accumulated an overwhelming amount of sleep debt and I feel absolutely dead mentally. To worsen my situation I have school to tend to as well, (and they are AP classes). I want to return to my original mental state very much. I wanted to know whether insomnia causes permanent/irreversible brain damage (especially at my age since I'm only 18 and my brain is still evolving). I sleep better now, but I still feel tremendously burdened mentally by brain fog due to my sleep debt. Please reply asap. Your feedback will be immensely appreciated.

Life

6 more posts in this thread. [Missing image file: 83056702.gif]
'Evnening /sci/ Is particles enough in order to create life?
9 more posts in this thread. [Missing image file: protein.png]
Is there a program to simulate whole protein reaction with an organic chemical compound ( ligand) and how is changes it conformation?
11 more posts in this thread. [Missing image file: 3426234.jpg]
May be a noob question but here goes, Isn't a gene just three nucleotides, what is the significance of three? Why do we classify them separately? The most logical thing I could come up with is let's say there are 5 DNA sequences differing in everything but a 3 consecutive nucleotides and still functional. Something like this could implicate that those 3 are the source of the function...?
4 more posts in this thread. [Missing image file: 1324186678112.jpg]
>2013 >using Mathematica >not using open source software like Sage >treating Stephen Wolfram like a god ISHYGDDT

Laplace!

2 more posts in this thread. [Missing image file: Penguins.jpg]
I'm stuck on a Basic Inverse Laplace Second shift theorem example. Can anyone help? (e^(-s/5))/((s^2)+4') Mega props to anyone who can help! (and show some work, not just w/a it ;) )
3 more posts in this thread. [Missing image file: awdc22.png]
Hey /sci/ i have a question about studying math. Right now i am studying cs and chose math as minor (minor subject, minor field of study, secondary subject (non English foreigner)). I had 3 math courses in cs: discrete math, analysis and linear algebra which were more practical than proving stuff. this semester i started to take "real" math courses and its good so far (i understand the subject matter and the exercises are ok). my problem is the proving of assertion. i understand the problem set, know why its correct or wrong but i have huge problems proving it... do you think this will get better over time and i just need to practice? whats your suggestions to improve my skills?
0 more posts in this thread. [Missing image file: superfluid.gif]
Is superfluid helium flow truly dissipation free? As in could I get superfluid helium flowing fast in a circular section of pipe, let it sit for awhile, then quickly open up the pipe and have the superfluid helium shoot out? Or would quantum vortex formation prevent this scenario?
2 more posts in this thread. [Missing image file: abacus.jpg]
Science is based on quantification, which may involve assumptions and abstractions - these need to be clearly stated. Can you answer these questions? How many moles of NaCl are in 5 grams? How many molecules of NaCl are in 5 grams? What is the molarity of a solution that contains 5 grams of NaCl in 100 mls of water? What is the molarity of Haemoglobin genes in the nucleus of a human liver cell? What is the molarity of words in a book? What is the molarity of books in your room? What is the molarity of fish in the sea?
20 more posts in this thread. [Missing image file: Untitled.png]
Hey /sci/ I just really can't solve this problem right here and I would appreciate if you can help me.
2 more posts in this thread. [Missing image file: 1357001639747.jpg]
hey /sci/ientists, I have a question that may not be relevant idk I mostly just lurk /tg/ but anyways, Would vape cigs be a good way to possibly deliver medicine? even just something as simple as something to sooth a sore throat or a cough or something. I'm in no way a Dr. but at least in theory it seems like it could be something that is just waiting for somebody jump on to make da big $$$
18 more posts in this thread. [Missing image file: superconductor magnet.jpg]
Since so much cool stuff (faster than light travel, teleportation, wormholes, death rays) isn't allowed under normal science, what do you consider the coolest thing that legitimately exists, within the bounds of scientific knowledge? I'd have to say superconductors. Even without the room temperature variety, they're like something out of science fiction, and you can do genuine sci-fi things with them.
1 more posts in this thread. [Missing image file: 1349050419730.jpg]
Help, vague physics problem that a monkey could probably do, but still eludes me. Two pucks collide, Puck 1 has velocity(x)=21 cm/s and velocity(y)=35 cm/s before collision and velocity(x)=-13 cm/s and velocity(y)=10 cm/s after the collision. Puck 2 has velocity(x)=-46 cm/s and velocity(y)=15 cm/s before collision. Find velocity(x) and velocity(y) for puck 2 after collision. (Assume that friction with ice is negligible. Complete the missing entries):(NOTE: The masses of the pucks are not provided because they are not needed... Do you see why?)
2 more posts in this thread. [Missing image file: Wimshurst.jpg]
Hello /sci/, I'm taking Physics II in college right now and it is really giving me a rough time. Lectures are not my strong suit and consequently don't learn anything from the class. If anyone is willing to help me out I would be extremely grateful. I don't need answers, just methods to get them. This is one problem I have... Two insulating spheres have radii 0.300 cm and 0.500 cm, masses 0.450 kg and 0.700 kg, and uniformly distributed charges of -2.00 µC and 5.50 µC. They are released from rest when their centers are separated by 1.00 m. (a) How fast will each be moving when they collide? (Hint: Consider conservation of energy and of linear momentum.) (b) If the spheres were conductors, would the speeds be greater or less than those calculated in part (a)? (Note: Assume a reference level of potential V = 0 at r = infinity.)
29 more posts in this thread. [Missing image file: Untitleb.png]
http://en.wikipedia.org/wiki/Wave_function_collapse Do you think the wave function collapse randomly chooses what to collapse into or is what the wave function collapse chooses what to collapse into based on something? If it's based on something (determined by something) what is it determined by? I don't think it could be random because it would require something that is capable of randomizing the choice, which nothing is capable of Would love to hear your thoughts on this.






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