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/sci/ Science & Math

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Most viewed threads in this category

14 more posts in this thread. [Missing image file: 1362844602871.jpg]
Theres been this weird twitching going on with the middle of my forehead. Like involuntary muscle contractations. They just started today but have been becoming increasingly frequent to the point where if I think to much about it itll happen. Sometimes the base of my head right above the forehead will twitch too. I dont know if its observable but jesus i can feel it. It doesnt hurt, just slightly annoying. Anyone know what this could be? no /x/ shit please pic not related
66 more posts in this thread. [Missing image file: bio_home_page[1].jpg]
Biology is the most bullshit science, this includes medical science. They tend to make up more data than any other group of scientists because they are the least empirical. Read this: http://www.theatlantic.com/magazine/archive/2010/11/lies-damned-lies-and-medical-science/308269/ Engineers, chemist, and physicist can't get away with this kind of shit because all of their work is backed by empirical evidence. There are a lot less redaction and falsely published studies in other fields of science when compared to biology. That is because they do real science, and not just look at shit under a microscope, or count water buffalo. Biology should be considered a soft science. Furthermore shit is always changing in biology which is just proof that biologist don't know what the fuck they are doing. There are also very few laws in biology that weren't taken from physics, chemistry, or engineering. At best biology is somewhere in between a hard/physical science and a social/soft/bullshit science.
8 more posts in this thread. [Missing image file: fa5.jpg]
chemfags, I'm working on a titration problem using a strong base and a weak acid A 40.0 mL sample of 0.100 M HNO2 is titrated with 0.200 M KOH. Determine the pH at the equivalence point for the titration. So I figured the amount of moles of base needed to reach equivalence is 0.004 moles, I added that to the initial moles bringing the number of moles of the conjugate base NO2- to 0.004 moles. Put that into molarity that's 0.004 moles/(0.0200 L + 0.0400L) = 0.06 M; then the pOH = 1.18 and the pH = 12.82. However the answer in the book lists the pH as 18.08. Can someone help me understand this better?
4 more posts in this thread. [Missing image file: chemistry-glassware.jpg]
Calculate the enthalpy change, in kJ, for the reaction: C2H4 +H2 -> C2H6, from the following data. C2H4 + 3 O2 -> 2 CO2 + 2 H2O H = -1411 kJ C2H6 + 7/2 O2 -> 2 CO2 + 3 H2O H= -1560. kJ H2 +1/2 O2 -> -> H2O H= -285.8 kJ Calculate the enthalpy change, in kJ, for the reaction: Ca + C + 3/2 O2 -> CaCO3, from the following data. Ca + 2 C -> CaC2 H= -62.8kJ CO2 -> C + O2 H= 394 kJ CaCO3 + CO2 -> CaC2 + 5/2 O2 H= 1538 kJ Calculate the enthalpy change, in kJ, for the reaction: 2 H2 + 2 C + O2 -> C2H5OH, from the following data. C2H5OH + 2 O2 -> 2 CO2 + 2 H2O H= -875 kJ C + O2 -> CO2 H= -394.51 kJ H2 + 1/2 O2 -> H2O H= -285 kJ Calculate the enthalpy change, in kJ, for the reaction: CS2(l) + 2 H2O(l) -> 2 H2S(g) + CO2(g), from the following data. H2S(g) + 3/2 O2(g) -> H2O(l) + SO2(g) H = -563kJ CS2(l) + 3 O2(g) -> CO2(g) + 2 SO2(g) H = -1075kJ
9 more posts in this thread. [Missing image file: theabaddon.png]
How do i make a dichotomous key in microsoft word? I went to ehow and it's telling me to go to format, i don't even know where format is.
6 more posts in this thread. [Missing image file: spacecraft.jpg]
Proof the Voyager probes were a hoax: What we supposedly have are space probes that went to 4 outer planets and gathered and sent back thousands of images. This was done with mid-1970s technology. By today's standards the probes were crude: - Flight Data System had a 250 kHz RCA CD4000 processor with 16 kb of RAM [http://voyager.jpl.nasa.gov/faq.html] - Vidicon tube imaging cameras - 8-Track tape for recording data for re-transmission We know that the cameras had a resolution of 800x800 pixels [http://pds-rings.seti.org/voyager/iss/inst_cat_wa2.html#inst_det] and the probes had a maximum upload rate of 1.4kb/s [http://voyager.jpl.nasa.gov/spacecraft/index.html]. With 3 channel color images this means that each raw image was 14.64 Mb in size. Assuming no compression it would have taken 178 minutes (3 hours) to transfer each image. Which means either they had to compress the images somehow or the 8 track tape they used had to have the capacity of several gigabytes (remember this is the mid 1970s) which would later, slowly, re-transmit images. And if they did compress the images, how would they do it with the slow 1970s processor, it would have taken longer to compress than to actually transmit them?


1 more posts in this thread. [Missing image file: AlbumCovers-BeachBoys-EndlessSummer(...).jpg]
If you're trying to guess a number at the lowest value between 1-200 which number would you pick and why? >you and 60 other players pick a number >can only pick a number between 1-200 >you can pick up to 10 numbers only
10 more posts in this thread. [Missing image file: yoneda lemma.png]
Is there any intuition behind understanding the Yoneda lemma? After struggling heavily I understood the statement and the proof but it still looks like a clusterfuck of indices and morphisms.
11 more posts in this thread. [Missing image file: God exists.gif]
>yfw you realize God exists
9 more posts in this thread. [Missing image file: page-0.jpg]
I am seriously stumped assigning this NMR spectrum. I could use some help. The compound of interest is (E)-1-(4-bromophenyl)-2-phenylethene. I need to know which peaks correspond to which hydrogens.
10 more posts in this thread. [Missing image file: french.jpg]
Pete, a professional bowler, is unhappy with any game below 200. Over time, 80% of his games exceed this score. What is the probability that Pete exceeds 200 in at least 9 of his next 10 games?
6 more posts in this thread. [Missing image file: 1346276766004.png]
Masters, I don't understand the 10 over 7 thing in this binomial probability formula. How do i calculate that? http://www.mathwords.com/b/binomial_probability_formula.htm
10 more posts in this thread. [Missing image file: tryptophan.jpg]
Trivial names > systematic names "anisole" > "methoxybenzene" "pyromellitic acid" > "1,2,4,5-benzenetetracarboxylic acid" "crotonaldehyde" > "but-2-enal" You know this to be true. Also, post your favourite trivial compound name so that we may all learn.
27 more posts in this thread. [Missing image file: Untitled.png]
Hello, /sci/. Been hitting this bitch with trial and error for a while now, and I'm inclined to say the answer is "no" based on just that. However, I'm sure there's an actually efficient mathematical way to approach this, but I just don't know it yet. Can anyone help? Thanks,
94 more posts in this thread. [Missing image file: 123332232.png]
So I decided to study engineering. I chose loosely based on this picture, of course it is only opinion of whoever made it but I think it's pretty true. How bad or how good did I choose? I was choosing between electronic, mechanical and computer sciences and informatics. The problem in our country is that there is not much information on what all this actually looks like so had I little idea on what I will do. Of course I checked on the internet and I have a picture in my mind but still. I'm asking for any advice, tips and information on engineering.

What program should people going into neuroscience choose?

61 more posts in this thread. [Missing image file: wallpaper-455447.jpg]
Initially, I assumed that taking a neuroscience Major/Specialist would be sufficient, but these posts: >>5602207 >States that a dual major, Math and Biology, is better, and to learn computer science. >>5604958 >States that Differential Eqn's and computational models are very important for understanding neuroscience papers From what i know, your major doesn't matter THAT much, but I'm just curious. if any other neuro hopefuls want to ask a question, you can ask them here if you want, hopefully someone higher up will grace us with their presence.

Uniformly Continuous?

19 more posts in this thread. [Missing image file: Uten navn5.png]
Hi /sci/! I'm gonna check if f is uniformly continuous, this is what I've been doing till now: By the definition a function is uniformly continuous if: \forall \epsilon>0 \exist \delta>0 : {x, y \in I, og 0<|x-y|<\delta} \rightarrow |f(x)-f(y)|<\epsilon I've defined I=[-1, 1], (can I do this?), then |x|<1, and |y|<1. I get that |f(x)-f(y)|<\epsilon becomes |x^2+y|<\epsilon, again; can I define f(x)=x^2 and f(y)=-y ? Then by, |y|<1 and |x|<1 I can hopefully find a way to turn |f(x)-f(y)| into some C|x-y|. Am I on the right track?
14 more posts in this thread. [Missing image file: maxima.jpg]
I have a problem using maxima, ev/solve to be precise. I need to solve set of equations for alpha,eta,phi but all I get is rubbish. Anyone knows whats going on ?
2 more posts in this thread. [Missing image file: 1340044764462.gif]
What is the limit of $\int_{a}^{b} f(x)\left |\sin(nx) \right |dx \right$ ? Some say 2/pi ?
3 more posts in this thread. [Missing image file: 20110707.gif]
How do I find the biggest whole number under 1 000 000 where its highest prime factor is 29 (which can appear multiple times)?

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