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/sci/ Science & Math

Threads added between 2013/03/13 and 2013/03/20

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Most viewed threads in this category

22 more posts in this thread. [Missing image file: 1355961706797.jpg]
Mathematician here, just took modafinil for the first time ever (1 tablet=200mg), well, by "just took" I mean about 35 minutes ago. Pulse right after eating the tablet: 74bpm Current pulse: 72bpm I masturbated just after taking the tablet, and subjectively feel like i got a stronger, longer-lasting burst of euphoria than usual after ejaculation. However, that could be the placebo effect. I am now going to review my math deck in anki (105 cards due), will report back after.
8 more posts in this thread. [Missing image file: Problem.png]
Proof that statistics is bullshit. Why is this shit even classified as mathematics? Its all subjective.
17 more posts in this thread. [Missing image file: 63114main_highway_med.jpg]
ITT: is space travel ever going to be available to average joes like a car? What hurdles are there for this to be a reality?
2 more posts in this thread. [Missing image file: Screen Shot 2013-03-19 at 11.42.55 PM.png]
Web Assign is literally the worst fucking thing ever.
1 more posts in this thread. [Missing image file: Miller2.jpg]
behaviorism, cognitivism, and connectivism. irreconcilable? all bullshit? >go
7 more posts in this thread. [Missing image file: image.jpg]
How does one graph/analyze the graph of g(x)= x^2 + (1/x)? I've been graphing rational functions for the first time and I came across this. An explanation would really be appreciated.
5 more posts in this thread. [Missing image file: babbylevel.png]
Babby level linear algebra question here, but my professor sucks so I'm having to teach myself from random books. What do? I have the answer key but no explanation as to how to actually solve it.
10 more posts in this thread. [Missing image file: big_dbe21c7367b721e3e86696627c7caa1(...).jpg]
What are some examples of preening behaviors in humans? I'm having trouble grasping the concept.
5 more posts in this thread. [Missing image file: constructioninging.jpg]
I kind of need some help. Is this possible /sci/? Can you find the values for the other two. The original estimate was lost due to a fire, and there were no soft copies then. So we decided to use the price per sq.mt. x area method.

CERN are doing a hangout in a few minutes to discuss the Higgs Boson announcement.

0 more posts in this thread. [Missing image file: 1308954086047.jpg]
https://www.youtube.com/watch?v=f6wDzNgz7xI Just for those interested.
24 more posts in this thread. [Missing image file: samsung-exynos-5-octa-chip-13633652(...).jpg]
I forgot all the math I learned in highschool. What is the best way t orelearn it in like 3 months time? Willing to study 10 hours a day 7 days a week. Want to take my SAT so I don't need to go to community college

Glow In The Dark

4 more posts in this thread. [Missing image file: Nooka-Mercury-Glow-In-The-Dark-Sung(...).jpg]
This was a question that me and my roommate were wondering about. When you have something that is made to glow in the dark, does it constantly radiate when getting hit by photons, or does it only begin radiating in the absence of light? If anyone knows, it would be great to get an answer. Pic related (ish). If I don't get an answer, I'll just do the research on my own and not be such a lazy ass.
16 more posts in this thread. [Missing image file: E^(-x^2).jpg]
Alright guys time to solve ?exp(?x2)dx from 0 to infinity.
13 more posts in this thread. [Missing image file: launchpad-board11.jpg]
I'm having a hard time grasping the concepts and behaviors of microcontrollers. Anyone know of any sources to teach oneself assembly and microcontrollers? or Someone please explain to me everything that goes on when a simple move instruction is executed (e.g. mov.w #0xABCD, R7). What happens in terms of the Status register, Stack Pointers, Program Counters, RAM etc... I need an in depth example with an explanation of what goes on in the innerworkings of micro controllers. >pic related. My microcontroller
7 more posts in this thread. [Missing image file: Sloth kong.jpg]
http://www.dailymail.co.uk/sciencetech/article-2259706/The-way-trip-Mars-received-1-000-applications.html What do you think of this?
10 more posts in this thread. [Missing image file: image.png]
"The cart is rolls frictionlessly on the table. It has a mass of 1kg. Attacthed to it are 2 strings, that go through two frictionless sheaves. The weights have masses as in the picture. a) How large is the acceleration of the cart? b) How large is the tension in the strings? c) We replace the cart with a box that also has a mass of 1kg, it then accelerates with 1.5m/s^2, find the friction force between the table and the box." I tried doing this one, and got every single answer wrong, even though I thought I knew how to do it. This is how I did it: a) The force pulling the cart to the left is equal to the force pulling the weights down since the cart is attached with a string through a sheave. The force pulling left is equal to: F=1kg?10m/s^2=10N and the force pulling right is F=2kg?m/s^2=20N, therefore the resulting force is 10N to the right. Since the cart has a mass of 1kg it accelerates with 10m/s^2. b) The tension on the left string is 10N (from above) and on the right one is 20N (also from above). c) This one I just have no idea how to do. The answers given in the book are: a) 2.5m/s^2, b) 12.5N and 15N, c) 4N
13 more posts in this thread. [Missing image file: 1340750522882.gif]
I missed the news a few nights ago, what did Curiosity find on Mars? pic might be related
6 more posts in this thread. [Missing image file: Project-Orion-Spacecraft.jpg]
Will we ever use something like Project: Orion or an EmDrive?
8 more posts in this thread. [Missing image file: lol.jpg]
Hey, I have to create an int-array with dynamic length within a class. This is my code so far: #include <iostream> using namespace std; class IntVector { private: unsigned int length; int *vec; public: void create (unsigned int l); void print (void); }; int main () { IntVector member; member.create(2); member.print(); } void IntVector::create (unsigned int l) { length = l; int *vec = new int [l]; for (unsigned int i = 0; i++;) { cin >> vec[i]; } } void IntVector::print (void) { for (unsigned int i = 0; i++;) cout << vec[i] << '\n'; } But when i execute it, nothing at all happens. What's wrong?
1 more posts in this thread. [Missing image file: 1329777821504.png]
>>>/r9k/6155408






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