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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: 1345567159908.gif]
(asinx+bcosx)^2 + (bsinx-acosx)^2. How do I simplify this?

What's your Cognifit cognitive score?

35 more posts in this thread. [Missing image file: 1254546103964.jpg]
Cognifit is a website that assess cognitive abilities of tens of thousands of participants from all around the internet, gauges their score against a normalized scale from 0-800, where the global mean is 407, and places them precisely on the global bell curve. When you register, click on the Assessment tab and 'Start Assessment'. It should take around 15 minutes. I wonder what's /sci/'s score as it is clearly the most intelligent board on 4chan. Registration is free and you can just bullshit whatever information you'd like including email (no confirmation required), though it is recommended that you'll give your exact age so that you'll be given a precise comparison of your score to people within your age group. So what's your score /sci/? Mine's 519. http://www.cognifit.com/
3 more posts in this thread. [Missing image file: 1318315832432.gif]
I'm trying to rearrange the rydberg equation to find 1/n2^2 So far I've got 1/n2^2 = (1/n1^2)-(1/(?*R)) but when I try to find the log of 1/n2^2 my answer keeps coming out wrong. halp pl0z?
19 more posts in this thread. [Missing image file: 1349095731587.jpg]
Anyone else hate FOBs?? They are the shittiest part about university. They hang out in annoying cliques, refuse to speak English, and are stubborn as fuck. Nothing is ever their fault, and they are sooo damn rude. They are also the sneakiest motherfuckers. I had an account to a homework site, and when I was checking an Organic problem, the blittle bitch carefully watched what I typed in, and immediately logged in on her own computer. fuck im pissed at them
16 more posts in this thread. [Missing image file: 1345856422240.png]
>realized im not smart enough for engineering Theres nothing i want more than to excel in math and science, but maybe I'm just not cut out for it. I cant even do well in calc I. The thought of majoring in anything else makes me sick. I feel like every other degrees in college is garbage and not even worth my time/money. I thought someone of average intelligence that gave it 110% would be able to squeeze through the curriculum. I'm beginning to think that is not plausible. I recently transferred with a 3.95 GPA from a community college to university and i've never been so stressed in my life. My hair is falling out by the second and im getting migraines on the regular. What the hell do i do?
9 more posts in this thread. [Missing image file: m2m1.png]
A block of mass m1 sits on top of a larger block of mass m2 which sits on a flat surface. The coefficient of kinetic friction between the upper and lower blocks is u1,and that between the lower block and the flat surface is u2. A horizontal force F pushes agaisnt the upper block, causing it to slide; the friction force between the blocks then causes the lower block to slide also. Find the acceleration of the upper block and the accleration of the lower block. This is all that I am given. I have no idea where to start. does anyone else know what to do?

Simple Physics problem.

10 more posts in this thread. [Missing image file: PhysicsFun.jpg]
After solving a difficult physics problem, an excited student throws his book straight up. It leaves his hand at 4.0 m/s from 1.5 m above the ground. solve for time, use two significant figures/digits. Can anyone help me with this problem? ive been at it for a long time, the last few hours on, it on assignment and i cant figure it out.
23 more posts in this thread. [Missing image file: 1349081817943.jpg]
Is Who wants to be a millionaire just a game of luck? I mean, there's 33.34% chance of being right unless the person happen to know the answer, and lifelines can only get you so far into the game.
22 more posts in this thread. [Missing image file: c9icholyz1q7i5lbxtqt.jpg]
Daniela Titan: why is the sky blue ? http://www.youtube.com/watch?v=DrAiBPEpSgE&feature=plcp
13 more posts in this thread. [Missing image file: GRADBEAK.jpg]
I have to write a Lab Report about an experiment, but I don't remember what was the uncertainty on one of the beakers I used. It was a 400ml beaker. I think it was +/- 0.005ml? Does it make sense, is it usually around that?
9 more posts in this thread. [Missing image file: 1290833021387.gif]
Who the fuck designed C++? I've never seen such a disgusting mess of a thousand rules and twice as many exceptions! Grah! Oh, you want to make a generic function? Here, just use template<class C>. Or template <typename T>. No, there's no difference, we just thought it would be fun with extra keywords. Now you want output, you say? Just use cout(). Of course, you should use cout << instead, otherwise it won't look good. No, you can't use << for other methods, don't be silly. Why is every fucking millimeter of C++ filled with stupid shit like this!? tl;dr: I mildly dislike C++
9 more posts in this thread. [Missing image file: footprint.gif]
Say a constrained mild steel beam is heated to 300C from 100C is it possible to calculate the stress induced by the expansion of the metal, also where would I find tensile-temperature allowable reduction tables for mild steel. 2 people here trying to decide something so would appreciate help with the principals and math
21 more posts in this thread. [Missing image file: specs.jpg]
/sci/ is there a way of changing how my brain works without outside help? If you have a serious psychological condition, can I change that by retraining my brain or anything without medication or therapy? Do those kinds of problems require an external stimulus to fix them?
2 more posts in this thread. [Missing image file: 1283415327716.png]
Prove that r' = -b + sqrt(b^2 - 2c) composed of positive integers b and c is an integer if r' is rational. I have absolutely no clue how to do this. Anyone want to help me prove this? I'll definitely be willing to work with you.
25 more posts in this thread. [Missing image file: 1345997657774.png]
sup sci, if limits of f(x) and g(x) as x tends to a do not exist, can limit of f(x)g(x) exist?
25 more posts in this thread. [Missing image file: jupiter-station-life-line-6.jpg]
At what age do most Americans learn calculus?

maths

7 more posts in this thread. [Missing image file: 2.jpg]
hey, can anyone help? I cannot find anything on google for this (maybe I didn't search right, but still): How would I show that (x-1) is a factor of F(x)=x^3 + 2x^2 - 7x +4 any help would be greatly appreciated

Noob

0 more posts in this thread. [Missing image file: 40366.jpg]
So I'm a student from Norway looking for books and litteratur to help comprehend the endless theories on how the world was created, string theory, big bang, and so on. Any suggestions ? Currently in 12th grade which would be equivalent of an American sophmore, just a pinpoint of how retarded I am. Thanks
7 more posts in this thread. [Missing image file: 200px-NIA_human_brain_drawing.jpg]
Is intelligence determined at birth, or the first years of your life? Can one increase one's IQ (or one's natural capabilities as a scientist) over time?
0 more posts in this thread. [Missing image file: 20253806.jpg]
I need your help guys with the second part of this question The air in a room is at 25°C and has a relative humidity of 55%, if the volume of the room is 200m3 and the atmospheric pressure is 1.013 bar calculate: The specific humidity. The dew point The mass of water in the room If the temperature of the room is now reduced to 10°C calculate the percentage of water vapour that will condense. If the room temperature is returned to 25°C what will the new relative humidity be? How do I go about calculating the percentage of the vapour condensed ? The vapour pressure at the dew point would be the same as the vapour pressure at 25 C, so do I subtract the vapour pressure at 10 C from the vapour pressure at 25 C and take a fraction of that ?






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