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/sci/ Science & Math

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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.
3 more posts in this thread. [Missing image file: help.jpg]
i need help can some do my homework Suppose the consumption function is C = $500 billion + 0.5Y and the government wants to stimulate the economy. By how much will aggregate demand at current prices shift initially (before multiplier effects) with Instructions: Round your answers to 1 decimal place. a) A $10 billion increase in government purchases? $ billion b) A $10 billion tax cut? $ billion c) A $10 billion increase in income transfers? $ billion What will the cumulative AD shift be for d) The increased G? $ billion e) The tax cut? $ billion f) The increased transfers? $ billion
4 more posts in this thread. [Missing image file: 38.jpg]
>Write a balanced equation for anisene with potassium permanganate, assuming the products include manganese dioxide and the potassium salt of acetic acid/potassium acetate. >Note: the reaction mixture is alkaline I'm pretty sure that instead of the chlorotrianisene, it's suppose to be anethole, seeing how only anethole is shown in the lab manual when referring to "anisene." Regardless, I'm completely lost, seeing how I can't get it to balance out.
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?
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.
4 more posts in this thread. [Missing image file: 4116479211_607b088786_o.jpg]
You're in charge of the Earth Space Committee. You're in charge of space travel, development, spacecraft design, etc. What do you do and what do you focus on? You'd have full corporation cooperation, like if you wanted Samsung in charge of the monitors, or something along those lines. What technology and research do you focus on? I'd focus more on liquid thorium flouride reactors, making them compact, and able to fit on and power a spacecraft. Work on mining rare earth elements and shipping them back to earth to sell for more funding money. Propulsion research. Energy research. Storage/battery advancements. This would create tons of jobs, benefit science and humanity as a whole, and advance us to a point in history where energy is no longer a concern.
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?

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