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/sci/ Science & Math

Threads added between 2013/05/01 and 2013/05/08

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Most viewed threads in this category

2 more posts in this thread. [Missing image file: 897.jpg]
exp(-ix)=cosx-isinx square both sides exp(-2ix)=(cosx)^2 - (sinx)^2 - i2sinxcosx l.h.s can be written again as cos2x-isin2x=(cosx)^2 - (sinx)^2 - isin2x cos2x=(cosx)^2 - (sinx)^2 cos2x=2(cosx)^2 - 1 voila!

Starting Out With Java: From Control Structures Through Objects PDF

19 more posts in this thread. [Missing image file: 41O2dc6AaqL._SL500_AA300_.jpg]
Hello /g/. I am looking for a proper PDF for the book Starting Out With Java: From Control Structures Through Objects. I tried looking for it online but could only find one version on Pirate Bay and all the file lockers. The problem with that version is that the text is very low quality making it hard to read. It is basically just a straight scan without addition of any tags or bookmarks. It would be great if you could find me a better version of this book. I would prefer fifth edition but fourth edition would also be great. Thanks!
10 more posts in this thread. [Missing image file: 3d1.jpg]
At 35 degrees C, K=1.6x10^-5 for the reaction 2NOCl -> 2NO + Cl2. Calculate concentration at equilibrium when 1 mol NOCl and 1 mol NO is initially put in a 1L flask. How do I set this shit up, it makes no sense to me.
30 more posts in this thread. [Missing image file: Hydrangeas.jpg]
estimate the work you do to mow a lawn 10m by 20m Assume you're pusing with a force of about 15N

Handwriting & Intelligence

34 more posts in this thread. [Missing image file: lot_stevens_witness_statement.jpg]
"On average, people with messy handwriting are more intelligent, for the following reasons: 1) Messy handwriting is intended mainly for the writer to read and not others, this indicates the writer is introverted, and therefore more inward thinking and intelligent. 2) When the writer reads the messy writing. He is reading fragments from the page and filling in the illegible gaps with his memory and predictions. As writing and reading is a common occurrence, messy writing would increase intelligence. 3) Messy writing may be the produce of fast handwriting, which would be needed of fast-thinkers." /discuss
6 more posts in this thread. [Missing image file: 1279054212527s.jpg]
Need halp. The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6. What is the probability that an individual's clotting time will be less than 7 second or greater than 8 seconds. Assume normal distribution.
4 more posts in this thread. [Missing image file: norton.jpg]
hey /sci/ I'm going over the acs review, and I'm stumped on this one question what is the mole fraction of water in 200. g of 95% by mass ethanol. C2H5OH MM=46gmol I tried putting 95g/100g of sln to figure out the moles of ethanol, but when I tried figuring water's moles in the equation I got a high number, around 11.01 moles
1 more posts in this thread. [Missing image file: GPS_Satellite_NASA_art-iif.jpg]
A satellite moves in a circular orbit around the Earth at a speed of 6500 m/s. The Earth's radius is 6.37*10^6 m and has a mass of 5.98*10624 kg. Determine the satellite's altitude above the surface of the Earth.
3 more posts in this thread. [Missing image file: Complete_diagram_of_a_human_spermat(...).png]
How long does it take for sperm to decompose that it would not be detectable as sperm in an open environment like a hotel room? How long after ejaculation can DNA be obtained from the sperm?
4 more posts in this thread. [Missing image file: SN 1572 Main_tycho_remnant_fullScrnSvr.jpg]
Which equation or principle of physics is used in the derivation of p =\rho gh ?

Pharmacokinetics - Calculating the mass of excreted metabolites

1 more posts in this thread. [Missing image file: Pharmacokinetics.jpg]
Alright, so, I'm very curious about this. Suppose a person, assumed a healthy male who has never taken it before takes 1000 mg of paracetamol. What would be the mass of the metabolites that he excretes through urine? If you don't want to do that example (no, this isn't homework) then could you just explain to me how you could get an approximation of the mass of the excreted metabolites of a drug?
0 more posts in this thread. [Missing image file: 27217_1138645326101_1826448306_2848(...).jpg]
Your favorite topic : Event Studies. Normally they are used to measure abnormal return in stock value, but is there any reason why they cannot be used to measure other things such as earnings growth ?. I'm thinking about using the market model to estimate a relationship between a firms earnings growth and the markets earnings growth and then see if a certain event affects the firms earnings growth. Is there any basic principle that I'm overlooking here ?
2 more posts in this thread. [Missing image file: 8X2cWV3.jpg]
this is a long shot, but worth a try. I'm basically trying to find how genomic tech has benefited biomedical fields. every journal I find talks about the genes that were discovered using different techniques like next gen sequencing, but I can't find how it's actually benefited society (drug development, stats showing disease decreasing because of it, etc) any help would be insanely appreciated.
6 more posts in this thread. [Missing image file: listeningpanel1.jpg]
http://www.wired.com/wiredscience/2013/04/baby-consciousness/ >Cognitive neuroscientist Sid Kouider of CNRS, the French national research agency, in Paris watched for swings in electrical activity, called event-related potentials (ERPs), in the babies’ brains. In babies who were at least 1 year old, Kouider saw an ERP pattern similar to an adult’s, but it was about three times slower. The team was surprised to see that the 5-month-olds also showed a late slow wave, although it was weaker and more drawn out than in the older babies. Kouider speculates that the late slow wave may be present in babies as young as 2 months. This late slow wave may indicate conscious thought, Kouider and colleagues report online today in Science. The wave, feedback from the prefrontal cortex, suggests that the image is stored briefly in the baby’s temporary “working memory.” And consciousness, Kouider says, is composed of working memory. Why aren't we doing more studies on infants to understand consciousness?
4 more posts in this thread. [Missing image file: image.jpg]
What is the best major for an individual looking to help advance the field of biomechatronics? Like, cybernetics, brain-machine interface, and intelligence amplification? I want to put computers in peoples brains pls help. Or, I guess more accurately, I want to design the machines, I guess. And probe the boundaries of what it means to be human. So Engineering? Biotech? Computer Science? Neuroscience? What schools?
8 more posts in this thread. [Missing image file: o-chem.jpg]
Hey /sci/, I'll be taking organic chem I next school year and to be frank, I am intimidated by the course and what I have heard of it from previous students. How should I approach studying for o-chem? Any good books/sites (I know about KhanAcademy).

Cell biology

4 more posts in this thread. [Missing image file: cell-biology.jpg]
I need some help /sci/ :( protein synthesis is such a bitch and I'm struggling with my homework. With what structure is the RER often seen to be continuous, as seen by its association with ribosomes? I think it's the outer nuclear membrane, yes?
3 more posts in this thread. [Missing image file: 1360798885012.png]
How the hell am I expected to find out what is exactly that I should do with the rest of my life? Right now I'm in engineering and I'm thinking about becoming a patent lawyer or an engine designer, but I don't want to lock myself down... What is the future of engine designing? I'm thinking of joining the automotive industry and working in America, Japan (master race), and Germany.
5 more posts in this thread. [Missing image file: 0507131807.jpg]
Found this in my math class, what the fuck is it?
9 more posts in this thread. [Missing image file: 1.png]
I'm having an argument with someone about ftl and they are claiming that electrons move between shells instantaneously, that is that they cannot exist between shells, just in one or the other. I'm not well-versed enough in this particular brand of physics to refute their statement. Can someone please tell me whether they're correct or not? TL;DR: Do electrons move between shells instantaneously?






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