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/sci/ Science & Math

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Most viewed threads in this category

0 more posts in this thread. [Missing image file: 350px-Relational_database_terms.svg.png]
Is there any connection between relational algebra and group theory?
38 more posts in this thread. [Missing image file: 1354436344199.png]
Challenge /sci/ Hypothisize on what gives 'space' deffinition Include deffinitions on the concuring particles & what the lend to the manifest of the structure
6 more posts in this thread. [Missing image file: 1292292582754.jpg]
How would you solve these? lim as x->0 (sin7x/sin4x) lim as x->0 (1-cosx/xsinx) lim as x->0 (sin(cosx)/secx)
12 more posts in this thread. [Missing image file: poguespan.jpg]
Okay, i don't browse this board often, and i'm sure you guys have seen this thread before. But i'm tired of boards being stupid about this. I believe that the plane won't take off because it doesn't have thrust (because it's going the same speed as the treadmill) and there for, no lift. Right? Can some one please tell me if i'm right, and if i'm not, why i'm wrong? Please, serious responses only.
4 more posts in this thread. [Missing image file: ujelly?.jpg]
13 more posts in this thread. [Missing image file: Bart-Procrastination-procrastinatio(...).jpg]
How to stop procrastination? I have a difficult math exam in 3 days that I did NOTHING for so far and instead of studying I'm browsing /sci/ and play video games... How to stop this? I like math but I can never get myself to study for it. The same counts for sciences and history. Sometimes I'm learning here on /sci/ about things way too complex for my age while getting a horrible score on a simple math test the next day. Any ideas?
0 more posts in this thread. [Missing image file: 56oE1.png]
I know I'll probably get a bunch of "lel homework" responses but this is technically prelab work and I'm stuck. So anyway, I'm doing a rotational motion prelab. Diagram of what the device looks like attached. In the following problems, assume the following parameters: Mass of the bottom steel disc: 1.4678 kg Mass of the upper steel disc: 1.4795 kg Mass of the upper aluminum disc: 0.4614 kg Radius of each disc: 63.3 mm Radius of the take-up spool: r = 125 cm Mass of the falling weight: 25 grams 1. Using the values given above, calculate the following: a) The moment of inertia of the lower, steel disc b) The moment of inertia of the upper, steel disc c) The moment of inertia of the upper, aluminum disc d) The combined moment of inertia of the two steel discs Which I found to be 2940.7kg mm^2, 2964.1kg mm^2, 924.39kg mm^2, and 5904.75kg mm^2 using moment of inertia= 1/2 MR^2 (capital M and R to denote different values from m and r to follow) 2.Using the results of problem 1, what percentage error is made by neglecting mr^2 with respect to I in the equation (mgr)/(mr^2+I) where I= Inertia I'm not sure whether to use exact values, or to just manipulate formulas for 2. I've tried both, gotten significantly higher percent error than I should've (the check is to affirm that we can neglect mr^2 due to really low percent error). Any help would be greatly appreciated.
0 more posts in this thread. [Missing image file: Genegun.jpg]
>"So, Agrobacterium tumefaciens doesn't work on corn. The fuck do we do?" >"Fuck it, let's cannonball the genes into the cellular core." God damn I love biotech.
4 more posts in this thread. [Missing image file: indolencevsdeadlineproximity.png]
Why do I always screw myself up like this
2 more posts in this thread. [Missing image file: bosspokemon.jpg]
alright /sci/, lets have a debate. in terms of human intelligence and learning, is the nature (Humans are either born stupid or born smart and no tampering can change that) or nurture (Human intellect can be increased through how they're raised and education) is correct and why? >pic unrelated
16 more posts in this thread. [Missing image file: 1to7.jpg]
Which hallucinogen gives the feeling of a leaking tap in the back of your throat? I think some faggot laced my weed with it...
2 more posts in this thread. [Missing image file: Capture.png]
My numbers are off, and I can't figure out where. Everything is proportionate. The angle of the roof is 6/12 or 1/2. I founded a couple numbers in the process to make them easier. Specifically the distance between the point of the glass triangle to the roof. Originally it came out to be 20.2", so I rounded is to 21" which added with the other small triangle at the top of 3" comes out to an even 2 feet, and total height of the triangle is 7'. Area of Triangle: 28' X 7' /2 = 98' Area of Glass Triangle: 10' X 5' /2 = 25' X 2 = 50' Area of Wall: 28' X 9.5 = 266' Area of Wall Windows: 7' X 4.5 = 31.5 or 31' 6" Area of Door: 6' X 7' = 42' Area of Glass on Door: 60" X 24" = 10' X 2 = 20' Total Wall Area: 406' Total Glass Area: 101' 6" The glass is supposed to be between 35-40% of the total area. 35% of 406' is 142.1 I'm not sure where I went wrong. Probably with the rounding.
3 more posts in this thread. [Missing image file: dumbass.jpg]
Doing a paper on temp staffing industry for college here. Language question, not a native speaker. What are port services? They're on a blacklist listing occupations excluded from dispatch work. Thanks a ton
1 more posts in this thread. [Missing image file: 220px-Lord_Kelvin_photograph.jpg]
I am giving a short biographical presentation of Kelvin to my thermo class (I'm a student, not the teacher). I have lots of facts, I've done the research already, but I need something attention grabbing, like a joke (from him, not about him) or something else that will grab a bored class's attention... anyone have any ideas? Anything related to the man is fair game, his life or work.
1 more posts in this thread. [Missing image file: IMG_0092.jpg]
can someone tell me the types of math learned in highschool/college ? I'm having trouble translating them. I'm a senior in HS and have to write a recommendation letter and I can't remember what are the principle math chapters. Mathematical Analysis Algebra Trigonometry Geometry Economic mathemathics Combinatronics anything else ??
6 more posts in this thread. [Missing image file: wall-e_eve-ai.jpg]
When we create true AI, do you think it's possible for there to be android comedians?

Nigerian scientist proves Riemann Hypothesis

5 more posts in this thread. [Missing image file: 1354384197758.jpg]
seeing as the other thread is now /pol/, lets have a new thread to actually talk about the math. here is a summary of the proof from the other thread: proof that \zeta(s) =0 \Rightarrow s=\frac{1}{2}+it with t real: \zeta(\frac{1}{2}+it) = \sum n^{-(\frac{1}{2}+it)} To prove that \zeta(s) =0 is to prove that \zeta(s) converges to 0, this can be done by taking \zeta(s) as t \rightarrow \infty . \lim_{t\rightarrow \infty} \sum n^{-(\frac{1}{2}+it)}=\lim_{t\rightarrow \infty} \sum \frac{(\frac{1}{n^t})^i}{n^\frac{1}{2}} as t \rightarrow \infty we see (\frac{1}{n^t})^i goes to 0, thus \zeta(s) =0 . This concludes the proof that \zeta(s) =0 \Rightarrow s=\frac{1}{2}+it with t real. >http://www.academia.edu/350005/Proof_of_the_Riemann_Hypothesis so is this the new Einstein?
3 more posts in this thread. [Missing image file: south pole co2.png]
/sci/, I have N measurements yi and each measurement has an uncertainty ?i. I made a linear regression and now I want to see if I get a better fit with a linear regression applied to ln(yi), but what is the uncertainty of ln(yi) ?
11 more posts in this thread. [Missing image file: International System of Units Prefixes.png]
Integrate 10/x dx
4 more posts in this thread. [Missing image file: WAT.jpg]
Hi there /sci/ Does anyone know how I can convert FSH and LH mIU's to ng/ml? Google didnt' help much. Any advice?






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