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/sci/ Science & Math

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Most viewed threads in this category

Why is linear algebra so damn boring?

45 more posts in this thread. [Missing image file: url.jpg]
How do you force yourself to work through mountains of boring mathematical shit when they're a prerequisite to more exciting topics? I'm trying to refine my scientific knowledge and I thought it would help to learn linear algebra. I knew it would be painful but I never expected this. I can barely stay focused. It's not like I'm not learning, it's just impossible to get into it and enjoy it on any level. Every inch I gain takes a monumental effort of personal discipline. I know for a fact that not all mathematics are like this. I actually enjoyed calculus to a degree. But linear algebra seems like the most frivolous axiomatic shit I've ever had the ordeal of studying. I'm sure some of you can /sci/entists can relate. How do you cope with this god-awful field? Or any topic you need to get through?

How do I determine if 'nofap' is pseudoscience?

6 more posts in this thread. [Missing image file: nofap.png]
I'm only just entering undergrad, and I stumbled across this group that gives off the vibe of a cult called 'nofap.' Their homebase is a section of reddit called r/nofap, and they claim things like "if you don't fap for about 90 days, your brain will reboot itself to its normal state" "by not fapping for an extended period of time, I notice girls are more attracted to me, and I get boners more often, and I actually grew to like them" "i have more energy due to higher testosterone, and I felt the effects of nofap even before I found out about it" Of course, these are all paraphrisations, but I want to know what /sci/ thinks. There must be trained physiologists here, right? http://www.reddit.com/r/NoFap/ http://yourbrainonporn.com/your-brain-on-porn-series https://www.youtube.com/watch?v=wSF82AwSDiU
7 more posts in this thread. [Missing image file: frustrated-lawyer.jpg]
Hey guys How the fuck does www.lazystudent.org work? Just found it on /b/: >>>/b/501287980
7 more posts in this thread. [Missing image file: Untisdagdhafhfdtled.png]
What is the full chemical equation for Rochelle salt + copper sulphate + hydrogen peroxide? You can see it here: http://www.youtube.com/watch?v=muE1wPzr398
24 more posts in this thread. [Missing image file: 1361512898885.jpg]
calc 3, differential equations can i take both at the same time? also should i take linear algebra first?
7 more posts in this thread. [Missing image file: heat.png]
My O/PDE professor exclaimed today that "Nobody does mathematics anymore; it is all differential equations." Perhaps he was a bit over-zealous in his exclamation, however, how much truth is there to this?

There's this problem

17 more posts in this thread. [Missing image file: .jpg]
So I'm trying to prove Newton's Binomial and I think I'm stuck, and I don't have much time [inb4: classical low will pleb excuse]. Here's how I do it: Proposal: At n\in \mathbb{N}(a+b)^n=a^n+{n \over 1!}a^{n-1}b+{n(n-1)\over2!}a^{n-2}b^2+...+{n(n-1)...2\over(n-1)!}ab^{n-1}+b^n _____________________________________________________________ At n=1: (a+b)^1=a+b Assume K\subset \mathbb{N} is a set of all the elements, that satisfy a proposal. It's already established, that 1\in K Assume k \in K: (a+b)^k(a+b)=(a+b)\bigg(a^k+{k \over 1!}a^{k-1}b+{k(k-1)\over2!}a^{k-2}b^2+...+{k(k-1)...2\over(k-1)!}ab^{k-1}+b^k\bigg) Proposal implicates: (a+b)^{k+1}=a^{k+1}+{k+1 \over 1!}a^{k}b+{(k+1)k\over2!}a^{k-1}b^2+...+{(k+1)(k)...2\over(k)!}ab^{k}+b^{k+1} After this I multiply (a+b)\bigg(a^k+{k \over 1!}a^{k-1}b+{k(k-1)\over2!}a^{k-2}b^2+...+{k(k-1)...2\over(k-1)!}ab^{k-1}+b^k\bigg)With a hope to get a^{k+1}+{k+1 \over 1!}a^{k}b+{(k+1)k\over2!}a^{k-1}b^2+...+{(k+1)(k)...2\over(k)!}ab^{k}+b^{k+1} I get: a^{k+1}+{k+1 \over 1!}a^{k}b+{(k+1)k\over2!}a^{k-1}b^2+{k(k+1)\over 2!}a^{k-2}b^3+...+{k(k-1)...2\over (k-1)!}a^2b^{k-1}+{k!+(k-1)!\over (k-1)!}ab^{k}+b^{k+1} Now it seems to be clear, that these two motherfuckers {k(k+1)\over 2!}a^{k-2}b^3+...+{k(k-1)...2\over (k-1)!}a^2b^{k-1} Eventually will meet in the middle of threedotsvania and pretty much give the needed polynomial, bu-u-u-ut... \mathrm{How\; would\; I\; show\; this\; mathematically?}
5 more posts in this thread. [Missing image file: sfwf.png]
/sci/... Fucking terminology difference is killing me... Basically, I'm trying to understand the whole: total head = dynamic pressure + static pressure However, there are A LOT of sources that are just...kinda hard to refer to. This is what I'm using right now: http://www.wrights-trainingsite.com/hydraulics_head.html But I also have a copy of my friend's past report that he did. But his uses different terminology. Not to mention, he doesn't even mention it in his report. He just has results. Pic related is the graph for the venturi meter in his report. Can someone help explain what exactly is each "head" supposed to mean? tl;dr Pump head equation, which pump is which "water height"?
6 more posts in this thread. [Missing image file: DR_Power_Burn_Cage_250.png]
Hello /sci/! I'm considering burning twigs in a home made burn cage. Is there a formula to calculate the shortest possible burn time for twigs in a cage without any help, such as adding oxygene or induction with a fan?

Tide

2 more posts in this thread. [Missing image file: 1335095482001.jpg]
I have a dumb question about tides /sci/entists I get that they're caused by the moon and that they get their energy from rotation and shit. But where does the actual water come from. Clearly even without the continents in between it couldn't be the same mass of water chugging along at one rotation per day. So is the water expanding? water has such shitty compressibility. Would it really expand that much because of that minute change in effective gravity?
11 more posts in this thread. [Missing image file: image.jpg]
> tfw going into uni for political sciences > tfw live in canada > tfw need to pick a new language to learn ( know English and Polish ) Choices are : Chinese, French, German and Spanish.
8 more posts in this thread. [Missing image file: oscar.jpg]
So uh, got a math deal that is confronting me. Seems like it would be a decent word problem. I currently have one oscar fish in an aquarium. I would like to add another. Oscars are monomorphic so you cant tell males and females apart, and if you end up putting two males together they will fight to the death. If you put two females together you have a 90 percent chance of them successfully living together. If you put a male and a female together you have a 75 percent chance of them successfully living together. I would greatly appreciate it if someone could tell me what my odds are for having a successful two oscar tank if i go out and buy another one today.
3 more posts in this thread. [Missing image file: 1362893317851.gif]
I'm trying to prove that n|(nCr) (for all r) if and only if n is prime. (1<=r<=n-1) Now proving that if n is prime then n|(nCr) is pretty easy, but how would you go about proving that n|(nCr) only if p is prime? Could you show that if n is not prime, then there exists an r such than n does not divide (nCr)?
6 more posts in this thread. [Missing image file: euleryo.png]
What is your favourite math methods book? Primarily aimed at a physics audience.
0 more posts in this thread. [Missing image file: creepy jordan.jpg]
Didn't see a Medicine board so I figured this was the best place. My mom came home today and said she has to go in for a CAT scan tomorrow, because she has an "abnormality on an artery" in her brain. What could that be?
4 more posts in this thread. [Missing image file: 1377110108338.png]
>NASA xenon-ion magnet field thrust engine >there is enough harnissable energy to power the world thousands of times over in just one year >tfw if the world stopped being greedy we could've focused on building sustainable energy sources everywhere >tfw if the world stopped being greedy we could've built machines to automate the majority of jobs >tfw if the world stopped being greedy we could've ended poverty >tfw if the world stopped being greedy we could've worked together to create awesome technology and visited other planets and galaxies >tfw if the world stopped being greedy we could've contacted intelligent extraterrestrial life forces

ketiig faintness

10 more posts in this thread. [Missing image file: bateman33.gif]
Why isn't there a proper cure for baldness yet /sci/ that I can just go and buy in a pharmacy. It's 2013. It shouldn't have to be this way.
12 more posts in this thread. [Missing image file: Artist.jpg]
Are emotions inherently irrational or what?
50 more posts in this thread. [Missing image file: rash.jpg]
Diagnosis time /sci/. Itchy rash being the only symptom aside from diarrhea which is most likely unrelated. Starting on the chest and neck, the rash has spread onto the lower half of the face along with over the entire torso and slightly down, starting on the extremities. Pic related. Aside from the rash, there are no other typical symptoms of meningitis (Not the right kind of rash), measles, etc. Chlorphenamine (antihistamines) has been administered with no effect.
1 more posts in this thread. [Missing image file: SNC00252.jpg]
Any other botany/growers /sci/? I just fucking love plants, live in hot as fuck So-Cal... can grow just about year round although it gets too hot in the late summer. Step out half plants look like they're just about to go, FUCK!!! Quickly spray with some cool water move out of the sun, go back to looking great right before my eyes. What's /sci/ growing?






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