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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.
151 more posts in this thread. [Missing image file: mqdefault.jpg]
What does /sci/ think of Vsauce?
18 more posts in this thread. [Missing image file: pic1.jpg]
Why are humans so high maintenance compared to other animals? I mean, I have a dog, I almost never give him showers, trim his claws, brush his teeth, etc. yet he's healthy as fuck. Humans can't get away with this. We start getting fucked up skin conditions, our teeth will rot out and we can't eat, we get nails that get to long and brake easily causing a ton of pain. Is there an evolutionary reason behind this or am I just exaggerating how important hygiene is for humans?
36 more posts in this thread. [Missing image file: 0003331719206_500X500.jpg]
How does TI get away with charging $120 for a graphing calculator... with 24kb of ram? itt: Someone who just lost his TI84
4 more posts in this thread. [Missing image file: 555ChargeController[1].jpg]
Hello sci. the use for this 555 chip uses its internal components: the comparators and flip flop. whats meant to happen is once a voltage above 12V is input to the 555 its meant to switch on a relay. so the circuit attached is of the circuit. Im a electronics newb and i cant seem to see how this circuit is going to function. if the input is "X" Volts the potentiometres split the voltage at the ratio of voltage split they are pre determind to split. so pin 2 will always recieve a higher voltage than pin 6. pin 8 is always going to be constant. so what happens is when pin 6 finally recieves higher voltage than pin 8 this will cause the respective comparator to produce its highest signal. at the same time pin two is well over the voltage it gets through pin 8 so its respective comparator is also outputing its highest signal. both comparators are inputing into the flip flop's set and reset pin so how the heck does this work ?
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]
6 more posts in this thread. [Missing image file: 2O5St.jpg]
Why pay for school, when you can get the best education materials free ? http://oyc.yale.edu/chemistry/chem-125a http://www.youtube.com/playlist?list=PL3F629F73640F831D&feature=plcp
2 more posts in this thread. [Missing image file: 644282_10151451549765219_39228751_n.jpg]
Anyone here knows how to answer these? y^{u}-2(y')+2y=e^{2x}(cos x-3sin x) y??+y=cos2x
20 more posts in this thread. [Missing image file: 556269_368479123217534_208049381_n.jpg]
What is 3d printing?

Good calculus book

5 more posts in this thread. [Missing image file: calculus2.png]
I'm looking for a good calculus book, without the endless paragraphs. I'm a visual learner. Have any ideas?

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