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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
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?
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.
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.
3 more posts in this thread. [Missing image file: sil.jpg]
/sci/ I need help with this problem. "A closed rectangular box is to be constructed with a base that is twice as long as it is wide. If the total surface area must be 27 square feet, find the dimensions of the box that will maximize the volume." *My work so far* Length = 2L Width = L Height = H I have Surface Area(SA) = 2(2LH) + 2(LH) + 2(2L^2) = 27 But I can't get past this first step as I set up the problem and tips on how to proceed?
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.
0 more posts in this thread. [Missing image file: God_of_War_Ascension_Aletheia_Engli(...).jpg]
God of War Ascension contains this cryptic message: Of all the prophecies I have seen, this one haunts my dreams. QUJIKPHIUEEEKMJQUJ The full truth of this nightmare yet remains hidden. – Aletheia The message in different languages: English: QUJIKPHIUEEEKMJQUJ French: QJFTRFJRQTEUCJTUNFRJHQJHQJFTRF Portuguese: MHDILMMLKHNHOKHDRLHMHD Spanish: QJFLTORJPJFOJIQJF /v/ and Neogaf are currently trying to decode it. >>>/v/180522797 http://www.neogaf.com/forum/showthread.php?t=522813 Any input would be appreciated.
3 more posts in this thread. [Missing image file: Tyrosine.png]
Would taking Tyrosine supplements increase my dopamine levels making me happier and more motivated? Include evidence.
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)?
3 more posts in this thread. [Missing image file: sucubus.jpg]
/x/ claims one can summon a succubus. Is such a thing even possible? I figured you guys might know if they're just screwing around or is there something to it.
36 more posts in this thread. [Missing image file: perelman.jpg]
I feel a mixture of envy and admiration for many of you here on / sci /. Let me explain: one of the few fields of human mental activity that is unreachable to me, to my brain, is mathematics. It is one of the most beautiful areas of intellectual exercise: there is no place for charlatans; for mediocre ideas; for sustained mistakes and for profiteers - is the queen of sciences and one of the purest and most crystalline expressions of beauty. And for me, however, mathematics is something of an enigma, an sphinx: I cannot understand it (I even have serious difficulties with the four basic operations), something that fills me with self-loathing and self-hatred. I'm a writer. I always had a huge talent with words. I remember once, before I even start with a real reading and writing practice, where my teacher at school suggested a homework for all the class, telling us to write an essay (I do not remember which was the theme ... freedom, democracy, equality: something like that). When my father was taking me to class, I remembered the homework, and started to do it right there in the car. I did not want to produce something meaningful: I just wanted to deliver the activity and get rid of it to not lose another grade (I had forgotten to do many activities). I wrote using my thigh as a table, with the movement of the car, my letters became with a crooked and blurry appearance. To my surprise, the teacher chose my text as the best of the class. It was a surprise.






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