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/sci/ Science & Math

Threads added between 2013/08/21 and 2013/08/28

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Most viewed threads in this category

10 more posts in this thread. [Missing image file: screenshot-large-khan.png]
What does /sci/ think of the new Khan Academy? I have not seen a single thread about this. Is anybody even using it? It has helped me immensely with math. I think the new system is cool and the mastery challenge is fun, but its like I went a step back in the amount of things I was 'proficient' in. It's probably for the better anyway and the old skill review system was a pain in the ass if you were away for any amount of time.
14 more posts in this thread. [Missing image file: images (1).jpg]
Is there a Bio-engineering major? Currently doing Telecom. Eng. because of current lack of other options. My dream is to create neuro transmitters that will allow us to communicate telepathically , or other Deus Ex kinda stuff. >TL;DR : Is there a DEUS EX major ???? >pic related, its Matt Damon on Elysium
76 more posts in this thread. [Missing image file: 1254546103964.jpg]
/sci/ always boasts about its alleged high levels of intelligence. Now's the time to prove it. http://www.iqout.com/start.php Post scores.
39 more posts in this thread. [Missing image file: vsauce.jpg]
What do you guys think of this guy? Do you enjoy his format? Inb4 people call him simplistic He's obviously a great educator, has a original entertaining style and other qualities
0 more posts in this thread. [Missing image file: Screenshot_2013-08-27-19-03-40-1.png]
http://www.brown.edu/Research/electronbubble/publications/papers/electron%20bubbles_03.pdf What does /sci/ think?
5 more posts in this thread. [Missing image file: sundials01.jpg]
If the suns course runs east to west why are sundials semi circular instead of rectangular or something?


3 more posts in this thread. [Missing image file: why3.jpg]
Why is (A-B)^2 = A^2 - 2AB + B^2 ??
12 more posts in this thread. [Missing image file: accounting.jpg]
Is accounting /sci/ approved?
8 more posts in this thread. [Missing image file: mantis.jpg]
The mantis shrimp whacks things with a force of around 60 kilograms, or 120 lbs, with each "punch". Given the shrimps low mass, why doesn't the shrimp shoot backwards or something? If it's putting out 120 lbs of force in one direction, shouldn't there be Newtonian principles at work? Yes, I'm stupid, don't insult me to much please :3
0 more posts in this thread. [Missing image file: Bike.png]
I'm having trouble with my science homework. I was hoping any of you could give me a hint how to approach this. Pic very much related. It's illustration of the assignment. B and A resembles where the tires meet the road. There is 1,54 meters between A and B. G is the center of mass located 0,5 meters over the ground. The horizontal plane between G and B is 0,7 meters. The biker and the motorcycle weighs 290 kiloes in total. I have to calculate the forces that affect B. Please help a student, who have been trying to figure this out for hours.
0 more posts in this thread. [Missing image file: Everyday Math 1st Grade.jpg]
Any thoughts on Everyday Math? I am waaay too old, but some of you whippersnappers must have used it. One of my little girls will be using it this year. Conservatives seem to think it's an abomination and perhaps a communist plot. It doesn't look so bad to me, except it seems to use "group work" a lot, and I think that's pretty much a waste of time for any kid with some ability. Thank you sincerely for any insights. Now get the hell off my lawn.
1 more posts in this thread. [Missing image file: ricin.jpg]
ricin poison does it biodegrade if left for a long time will it lose its toxicity?
5 more posts in this thread. [Missing image file: 1331245730850.gif]
Hey, I'm reading "Mathematical Methods in Quantum Physics" by Gerald Teschl and he uses some function called \chi\Omega_n, googling chi omega only gives me some stupid fraternity. Anyone know what this refers to? TLDR; \chi\Omega_n WHAT MEANS?
0 more posts in this thread. [Missing image file: hunter_one_resize_by_emilisb-d6dmp6i.jpg]
Okay, question time. So I know that dB is a representation of signal gain/loss without reference and that dBm is with a referance of 1mw. Now the free space path loss equation( dB = 20log10(d(km))+20log10(f(Mhz))+32.45 ) calculates the drop of signal over a distance at a frequency. So if i calculate a drop in dB how would I calculate the signal power in dBm provided I know the output power of the transmitter.
5 more posts in this thread. [Missing image file: Capture.png]
So ive have a mechanics test in the morning, on statics, ive haven't done statics since first semester ( as this is a repeat exam) and i was wondering if any one if anyone in /sci/ could help refresh me how to do these questions. I'll be dumping a few questions that are likely to come up tomorrow >seriously regretting not doing physics in school. >pic 1/7
1 more posts in this thread. [Missing image file: 1350642016139.jpg]
after 5 years of working i returned to school and physic for beginners is quite a challenge so i just ask if any of you could help a car with 80 mph passes a gas station. at that point another car starts from that gas station and speeds up to 100 mph. when will the second car reach the first one?
1 more posts in this thread. [Missing image file: hue.jpg]
why isn't locale theory taught more often in topology courses? because it's pointless
10 more posts in this thread. [Missing image file: 152.jpg]
Will try to post those daily at 9pm UTC / 4pm EDT
0 more posts in this thread. [Missing image file: 1376368567519.gif]
What's a good real analysis refresher? I received a masters in mathematics a little bit over four years ago, so a book like Steward (or whatever it was called) isn't really what I have in mind. Something quick but thorough, please. Thank you.
4 more posts in this thread. [Missing image file: 1377641062805.jpg]
I was making pic related, and when I lit the alcohol, it was burning pure yellow until it burnt out? Why is that?

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