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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
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
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?
2 more posts in this thread. [Missing image file: thermo2.gif]
Some simple true or false, does /sci/ want to help? Evaporation is an exothermic process because the system gives off energy. Condensation is an exothermic process because the system gives off energy. The water in the system is undergoing a reversible process at 373K and 1 atm pressure. Under these conditions, both boiling and condensation may occur. The freezing of water is an endothermic process because the system absorbs energy. The melting of ice is an endothermic process because the system absorbs energy. Heating water is an endothermic process which increases the internal energy of the system. As steam condenses, the surroundings are absorbing energy from the system. My answers are: FTTFFTT

COLOURS

15 more posts in this thread. [Missing image file: redblue.jpg]
If I had an LCD Monitor with 1 billion pixels... and I put red and blue on each pixel sequentially - what colour would the screen look when you stepped back from it? Because in paint, when you mix the pigments you arent actually creatig a chemical reaction to make a new colour, you are just putting coloured particles very close together. You eyes perceive a new colour, but in fact the two coloured parts are still separate.
0 more posts in this thread. [Missing image file: images.jpg]
Anybody studying for the actuary exams or working as an actuary? Any advice on books that helped? What do you think about the job? etc..

Group Algebra

10 more posts in this thread. [Missing image file: latex.php.png]
So guys I need some help. Suppose we have a finite group G, and the field C. Now we the look at the algebra C[G]. One definition would be the canonical vector space, over C with the Basis G. However, one can also define C[G] as the set of funcitons from G to C. The question that I can't seem to answer: How are those defnitions equal? I do know that both objects have the same dimension, but I can't seem to find a isomorphism or a map from one to the other.
0 more posts in this thread. [Missing image file: IMG_0222[1].jpg]
Hey guys I don't really understand this question on Simple Regression and hoped you guys could help Denote by r the sample correlation between a pair of random variables show that 1 - r^2 / n - 2 = Se^2 / SST Part B is in my pic.
17 more posts in this thread. [Missing image file: rtrbltlbleftdownrightupleftdownrightup.png]
Halp pls. Or at least tell me what the line in the middle is called. Oh and I need to show work, but it's cool if you just tell me what it's called.
4 more posts in this thread. [Missing image file: george[2].jpg]
Any chemists here, man? I honestly never knew what should I do with my life, but in high school I actually fell in love with chemistry. At first I didnt really give a fuck about anything, but you know those great teachers that are one in a million? That actually like to teach and like their subject, it helped me when it came to the decision of what to do for the rest of my life. But as I looked deeper into the matter, I found a horrible reality. Chemists are underpaid, have repetitive tasks, shit like that. Plus the possibility of ending up as a teacher scares the ever living shit out of me. I got in med school instead, but damnit every time I think about getting a degree in chemistry I just get this feeling of uncertainty. >TL;DR any chemist that can tell me about their job, tasks, payment, structure, etc.

NDE. IDK. WTF.

4 more posts in this thread. [Missing image file: kelley-NDE.jpg]
Near Death experiences and clinical death. Loads of people have suffered them, several researches are being done at the moment. Skeptics who dismissed NDE as illusions turned into believers after some investigation. Your thoughts, /sci/? >Inb4 lack of O2 in brain. No, this has been discarded already. >Inb4 any new age or religious comment. Let's get serious, please.
11 more posts in this thread. [Missing image file: url.jpg]
Hello! I am a web designer, but have always been interested in physics and the universe. I find the best way to learn is either working hands on or by reading. I have been trying to assemble a good list of books that give some broad explanations of physics and the universe, but do not explain them in such a way that you need to already be a physicist. Does this list look ok? Anything you would add or remove? A Brief History of Time --Stephen Hawking Black Holes and Baby Universes and other Essays -- Stephen Hawking The Universe in a Nutshell -- Stephen Hawking The Future of Spacetime -- Stephen Hawking, Kip Thorne, Igor Novikov, Alan Lightman The Nature of Space and Time -- Stephen Hawking and Roge Penrose The First Three Minutes -- Steven Weinberg The Discovery of Sub-atomic Particles -- Steven Weinberg Dreams of a Final Theory -- Steven Weinberg The Character of Physical Law -- Richard Feynman QED -- Richard Feynman The Pleasure of Finding Things Out -- Richard Feynman The Meaning of it All -- Richard Feynman The Quark and the Jaguar -- Murray Gell-Mann Beyond Star Trek -- Lawrence Kraus Space, Time and Gravity -- Robert Wald The Trouble with Physics -- Lee Smolin The Emperor's New Mind -- Roger Penrose The Road to Reality, A Complete Guide to the Laws of the Universe -- Roger Penrose The God Particle -- Leon Lederman Conversations on the Dark Side of Physics -- Edward Teller Superstrings -- edited by Paul Davies and J. Brown The Inflationary Universe -- Alan Guth The Elegant Universe -- Brian Greene The Fabric of the Cosmos -- Brian Greene Relativity, the Special and General Theory -- Albert Eiinstein

0/0

7 more posts in this thread. [Missing image file: 83079026.gif]
Hi /sci/! Regarding 0/0, why is this undefined? Isn't anything times zero zero? 1/0 = a 0/0=a0=0?
0 more posts in this thread. [Missing image file: 1358479333173.png]
Tips needed for writing a science literature review? >look at stuff written in the past 5 years >summarise topics using these sources >say what further work can be done >give opinion on strengthes/weaknesses of sources Anything else I should do? How do I know which papers are the most relevant?
9 more posts in this thread. [Missing image file: prime- square 12a zoom.png]
ProjectEuler #37 >The number 3797 has an interesting property. Being prime itself, it is possible to continuously remove digits from left to right, and remain prime at each stage: 3797, 797, 97, and 7. Similarly we can work from right to left: 3797, 379, 37, and 3. >Find the sum of the only eleven primes that are both truncatable from left to right and right to left. This one is doing my fucking head in. How do we know there are only eleven truncatable primes? What are the bounds? Please hope me, /sci/

hardware help

7 more posts in this thread. [Missing image file: Light_dispersion_conceptual_waves.gif]
non-physics major needs your help. i want to analyze light. how would i go about acquiring the spectral data? if i can split a beam, what kind of hardware interface/software tool can I use?
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?
24 more posts in this thread. [Missing image file: Unit_circle_angles_color.svg.png]
Fuck, I get it... You only need to remember the first 3... pi/6, pi/4 and pi/3 And then the rest are just pi - pi/3 is 2pi/3... like 1 minus a third is two thirds... Minor lightbulb moment. I'm gonna make it /sci/
16 more posts in this thread. [Missing image file: withscience.png]
What do you think, /sci/






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