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/sci/ Science & Math

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Most viewed threads in this category

7 more posts in this thread. [Missing image file: phy237 hw1 question.png]
Alright so I'm stuck here. I'm supposed to find h(t) in the form of h*cos(wt+\phi), but I don't know how to approach this without h1=h2 or phi1=phi2. Is this problem solvable?
34 more posts in this thread. [Missing image file: dylan-sharhon_1st-year-ca(...).png]
hey /sci/ i was wondering if anyone could recommend a good, comprehensive book for learning calculus im pretty neet at the moment so i've got a bunch of free time and was eager to get a head start on one of the more difficult subjects (for me)

Help, mighty chemfags?

7 more posts in this thread. [Missing image file: 1390176585630.jpg]
>20.7g of HCL react with 28.4g of CaCO3 and both reactants are consumed completely. How much CO2 is released during the reaction if the other products weigh 36.6g? At first I thought I could just subtract 36.6g from the sum of the masses of the reactants, but some of the mass is lost to heat right? I can maybe find out how much heat the reaction releases, but I know no way to convert heat to mass.

Stupid Question Thread

23 more posts in this thread. [Missing image file: images.jpg]
Didn't find it, so I guess I'll start it. I'm trying to find the angle between a plane \alpha: 2x + 3y + z - 4 = 0 and the vector \vec{v} = [4, 3, 5]. It's supposed to come out to 56.3^{\circ}. When I try subtracting \angle(\vec{n_\alpha}, \vec{v}) = \cos^{-1} \left( \frac{22}{\sqrt{ 14 \cdot 50 }} \right) from 90 degrees I still don't get the right answer.
60 more posts in this thread. [Missing image file: image.jpg]
Is there a scientific explation for why some people are gay/bi?

Economics

3 more posts in this thread. [Missing image file: eminem-encore-07-pistol-i(...).jpg]
I'm completing my Economics BA but the actual economics courses ended by the beginning of the third year and were terrible in general, jumping from basics to dynamic models and differential equations so at the middle of the course everybody was struggling with math problems not being able to explain the application or the essense of the model. I want to self-study the courses once again before graduating and deciding whether I want to enroll into MS's. I need books on Micro/Macro. Something without tons of texts, like a review of basics. In uni we jumpstarted into Varian/Blanchard and transisted to Romer and Advanced micro by Varian during the same year. Needless to say it was a rush and a struggle for me. Should I read something before starting with Varian+Blanchard again? Or is it ok to start with micro-macro-1 skipping the simplistic models of micro-macro-0?
98 more posts in this thread. [Missing image file: mgtjVsu.jpg]
Can we get a study thread? Only hard, STEM degrees need to apply Do you listen to music when studying?Ambient, instrumental, choirs? How big is your study session and how many breaks do you take, how big are the brakes How many hours do you study per day during finals? How much sleep do you get? Can you stay focused after 12 hours? Are you proud of your grades given your work in to it?
24 more posts in this thread. [Missing image file: analytical image.jpg]
Hey /sci/ Im taking Analytical Chemistry this semester at my university and I was wondering if any of you guys have taken it and could tell me how easy or difficult the class was. Thanks in advance.

Music

7 more posts in this thread. [Missing image file: image.jpg]
/sci/entists, biologically explain the chills one gets from good music
1 more posts in this thread. [Missing image file: 1387126996120.jpg]
What would it take to make an accurate RNG predictor? It uses a mersenne twist and the seeds are kept server side. I am seriously considering paying someone to make this provided it can be done.
4 more posts in this thread. [Missing image file: taco.gif]
Can we have a topic where we recommend good "pop sci" books to each other. I mean shit that's accessible to competent individuals and recognized by specialists as being true, but written at a baby level. For instance, somebody who is a physicist could recommend a good book that would explain the Everett interpretation of quantum mechanics, but that didn't talk about non-sci shit like the existential crisis of living in a deterministic universe, or the "multiverse" and all the versions of history where Hitler is Obama. I'm sure people will bitch about this, but not everyone on this board has 4 PhDs like you so let's be nice. As a mathfag, I really liked Jeffrey Weeks' "The Shape of Space". It's a totally plebe level book from a topological perspective, but since plenty of gradfags don't even study topology it's quite fun. Literally anyone can read this book too, so at least give it to your braindead mom or something. I also really recommend Prisoner's Dilemma by Poundstone. It's a bit more historical, but von Neumann kicks ass and it introduces the layman to Game Theory and why it was important during the war.
19 more posts in this thread. [Missing image file: tumblr_lhjsjnYjjr1qhd08xo(...).jpg]
Haiku's about science at University: I'll start. I can't prove this thing Why the hell can't I prove it? I'll just google it
12 more posts in this thread. [Missing image file: dotproduct.png]
Sci I keep watching geometric proofs of the dot product and it goes fine up until when every video claims that taking the dot product of a vector against itself (i.e. A · A) results in a value equal to the square of the vector's length. How can a proof of the dot product require me to accept a property of the unproven dot product? Does this mean no one really understands what is going on?
2 more posts in this thread. [Missing image file: 1387053888155.jpg]
Is spascial ascent calculatable using reverse integers?
37 more posts in this thread. [Missing image file: stem_cell_research[1].jpg]
Why the fuck are morons allowed to dictate science policy? >Embryonic stem cells come from aborted fetuses No, they fucking don't. They come from left over embryos not used in in vitro fertility treatments. >Man made global warming isn't real Then why the fuck is the Cato Institute (once avid opponents of global warming) investing so much time into geoengineering? >Vaccines cause autism No your shitty genes and possibly gut microbes along with a number of factors such as saying "vaccines cause autism" are what cause autism. >Net neutrality is an unnecessary government regulation. Enjoy your shitty torrent speeds. >Chem trials are part of a government conspiracy to ... FUCK YOU!
5 more posts in this thread. [Missing image file: 1387657460020.jpg]
Is Universe a markov process?
29 more posts in this thread. [Missing image file: sentence-structure.png]
/sci/, please take me back to when I was never taught this and teach me the math behind grammar and sentence structure
120 more posts in this thread. [Missing image file: 1234658.jpg]
so, /sci/, what is your opinion on the plausibility of warp drives? Possible or impossible
22 more posts in this thread. [Missing image file: electricshock.gif]
So what's the deal with electric shocks? I've had people tell me "It's not the voltage that matters, it's the ampere". Does this mean that getting shocked by my 12V 62A PSU is much more dangerous than getting shocked by my 230V 13A wall socket?

Mysterious Martian Rock?

80 more posts in this thread. [Missing image file: mystery-mars-rock-picture.jpg]
So what's /sci/ take on this? From CNN: "Scientists are baffled by a white rock with a dark red low spot in the middle that "just plain appeared at that spot" on the planet where the rover is situated, says Steve Squyres, lead scientist of the Mars Exploration Rover mission. In recent weeks, Opportunity took photos of the same spot on Mars, 12 days apart. The rover's panoramic camera showed only barren bedrock on mission day 3528 (in Mars time), but on day 3540, a photo of the same scene revealed the mysterious, doughnut-shaped rock. The photos of the outcrop showing the absence, and then presence, of the pastry-sized rock were taken 12 days apart. The rover had not driven over that spot, Squyres said. There are two leading theories about where the rock, called "Pinnacle Island," came from.






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