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/sci/ Science & Math

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Most viewed threads in this category

9 more posts in this thread. [Missing image file: 91911606_XS.jpg]
/Sci, help. Just switched programs and am finishing up my first semester of Chemistry. Just having a little trouble with these problems... 1) For each element, predict where the "jump" occurs for successive ionization energies. (For example, does the jumper occur between the first and second ionization energies, the second and third, etc). >Not going to include the variety of selections because I really just need an explanation of the methodology behind solving this one, I'd rather actually do it myself but I'm not even sure where to start. 2) Life on Earth evolved around the element carbon. Based on periodic properties, what two or three elements would you expect to be most like carbon? 3) The heaviest known alkaline earth metal is radium, atomic number 88. Find the atomic numbers of the as of yet undiscovered next two members of the series >inb4 retarded irl >thx /sci
6 more posts in this thread. [Missing image file: image1.gif]
How do you write the radius of a horizontal cross section of this figure in terms of it's height? I need to know how to complete this calc problem but I'm a fucking idiot, and you all aren't. Thanks


11 more posts in this thread. [Missing image file: dp1-vn.jpg]
Long story short, I just finished watching steins;gate, so I officially have a PhD level of understanding in physics. Hence, why I came here. So tell me mad /sci/entists, how the hell would you go out making a time machine that could send text messages into the past?
3 more posts in this thread. [Missing image file: eye.jpg]
How do we see and focus each thing we saw?
4 more posts in this thread. [Missing image file: 1353888309231.jpg]
Sorry if I'm being stupid here: sinx - cosx =sin(x)-sin(x - pi/2) =??? =(squareroot(2))sin(x + pi/4) Wolfram gave me the last line and I don't know how it got it.

Jung and Briggs

6 more posts in this thread. [Missing image file: smart-glasses-brains-girl-sexy-cubb(...).jpg]
Website where one can take a FULL skills assessment test or personality test FREE online to help lead them in a certain direction regarding an educational plan. Pic unrelated, kinda
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.
9 more posts in this thread. [Missing image file: mars-soon.png]
Would anyone else die happy if extraterrestrial life was discovered within our lifetime? Oh, and I heard you people like cool science related videos. >www.youtube.com/watch?v=bIy6w_iubSs
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

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