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/sci/ Science & Math

Threads added between 2013/03/20 and 2013/03/27

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Most viewed threads in this category

9 more posts in this thread. [Missing image file: AoPS.gif]
Can anyone tell me where I can find the entire Art of Problem Solving series (including solution manuals) or any part of the series at all? I could only find the Introduction to Algebra book after scouring the typical torrent/direct download sites on the /sci/ guide.
12 more posts in this thread. [Missing image file: vanillin.png]
For those who've dealt with Vanillin + NaBH4 reaction: So I've got the vanillin/ethanol and BH4/NaOH solutions mixed together, and will add HCl until it's acidic. Then I plan on ice bathing this to get a precipitate of the vanillyl alcohol. Looking at some online procedures and a video, this is as far as they go, but one or two others take this precip and do a ethanol heating/evap process to it. So for those who have experience with this, is that really needed (or in other words, did you do that)?

Prime Number

26 more posts in this thread. [Missing image file: pythonlol.jpg]
Hey, /sci/, I'm in a basic programming class for python, and I'm having trouble understanding the in-class assignment that was given today. Could anyone help me out? The problem is as follows: A prime number is a number that is only evenly divisible by itself and 1. For example, the number 5 is prime because it can only be evenly divided by 1 and 5. The number 6, however, is not prime because it can be divided evenly by 1, 2, 3, and 6. Write a Boolean function named is_prime which takes an integer as an argument and returns True if the argument is a prime number, or False otherwise. Use the function in a program that prompts the user to enter a number and then displays a message indicating whether the number is prime. We're working in python 3.2
5 more posts in this thread. [Missing image file: 1347146347922.jpg]
/sci/... Why the fuck is probability so confusing? I know it shouldn't be but I am having trouble with grasping even the basic concepts for longer than a day or two even though pretty much all other mathematics stuff comes relatively easily to me. Take for example this question; You have 16 black cards and 14 red cards. If you randomly pick 10 cards what is the probability that you will pick 7 black cards and 3 red cards? I feel like it's at the tip of my tongue but I just can't reach it. And as I said, I am aware that it is babby probability.
7 more posts in this thread. [Missing image file: 1364289324815.jpg]
So are "homework threads" allowed on /sci/? I don't understand the concept of a "homework thread'. Any math problem addressed here can be a problem being thought about in one's head.
11 more posts in this thread. [Missing image file: 1363328994035.jpg]
>>please spend 3 hours graphing the function
21 more posts in this thread. [Missing image file: mathclass.png]
Today is your math test, let's see what you've got
23 more posts in this thread. [Missing image file: HorseCart1.gif]
Horse and wagon problem. When the horse pushes of the ground with the force A, doesn't he also pull the cart/the cart pull him with the force A? I mean, they're attached to each other. Why can the horse pulls cart/cart pulls horse force be weaker than the horse pushes ground/ground pushes horse force? They cannot be the same, if we assume the horse is able to pull the cart, since the net force would be zero, as then the horse WOULDN'T be able to move the cart. They can't be different though, because then the cart would accelerate faster than the horse, if we assume they weigh the same, and it can't, since they're attached to each other. Where am I going wrong?
6 more posts in this thread. [Missing image file: time.jpg]
what is the terminal velocity of a soccer ball falling from 1 AU distance towards the sun (note: it falls straight towards the sun with no gravitational interference from other planets, moons, etc.)
14 more posts in this thread. [Missing image file: 1363782440936.gif]
How you correlate GPA with intelligence? Do you see people with high GPA as being geniuses (considering its a difficult course in a renowned university)? When i first got at university (eth zurich) to study EE i was considered to be the smart / weird kid in the class because i had good solutions and answers for the problems that the teacher used to propose. I also noticed a lot of mistakes that the teachers did and even-though i am blind to details i could develop complex ideas in my head very easily. Now i am in my last year and i am quite average, i struggled with linear systems and signals but i passed. The kid who is considered intelligent now is a guy that doesn't even study and have a 3.8 GPA, he used to compliment my intelligence and now i feel extremely dumb by his side. So yeah, i am feeling insecure about my intelligence and i wanna know what /sci/ thinks about the correlation between intelligence and GPA.
2 more posts in this thread. [Missing image file: whipcream eyepatch.png]
I feel like i fucked this entire thing up can someone tell me what i did wrong if i did anything wrong?
16 more posts in this thread. [Missing image file: cleopatra.png]
What is the most fundamental form of logic? Is there something more intrinsic than axioms?

EE Help pls

4 more posts in this thread. [Missing image file: imagesCA8NEZD6.jpg]
Hey /sci/ - EE here, I've missed some lectures and I'm falling behind in class. I need to learn about Latches, Flip Flops, Timing diagrams, and synchonous/asynchronous machines. Is there a Khan Academy - esque EE website for idiots like me who can't understand this stuff from the textbook? Thanks
9 more posts in this thread. [Missing image file: BETA-GAMMA-SIGMA.jpg]
I just got something in the mail for a "Beta Gamma Sigma" thing that wants $70 from me to be a member. Is this a scam or is it worth paying for?
15 more posts in this thread. [Missing image file: 1357610199872.jpg]
Is it correct to say "the breaker blew because too much wattage was being pulled through it" instead of "the breaker blew because too much amperage was pulled through it", is saying wattage correct when really referring to amperage in this situation since the voltage is fixed and not variable.

Math Genius Please

7 more posts in this thread. [Missing image file: saviour.png]
I posted this on /b/ and realized this place exists about two seconds later... I need a math genius, one of my grandparents just died. I know how much each grandchild got, and how much each great grandchild got. Parents won't tell me how much their portion is. I feel like it's on the tip of my calculator, but I just am not smart enough to finish this. Give me a guess based on these numbers. Please? There were 11 great grandkids and each got $5,000 There were 9 grandchildren and each got $27,500 What did the 4 children get? Come on tell me what my mom is hiding.
6 more posts in this thread. [Missing image file: NMR Post Lab Spectra Done.png]
Is there something I'm missing here with regards to the 17H peak on the H NMR spectrum? That peak seems a little nuts, and I think it's impossible to have 17 identical hydrogens.
6 more posts in this thread. [Missing image file: Steel Beam Shapes.jpg]
Can anyone explain why the moment of inertia with respect to x is =b(h^3)/12. Where h is the height (y) and b is the width (x)?

is it just me, or is this guy so, so wrong about everything?

2 more posts in this thread. [Missing image file: yada.jpg]
http://www.youtube.com/watch?feature=player_embedded&v=4gFi285OhrQ "dogma number something, scientists believe matter is unconscious." His conclusion, humans, animals, trees, etc must also be unconscious.. think i laughed my way through all but 3 of his 10 "dogmas every educated person [apparently] believe."
1 more posts in this thread. [Missing image file: Captura.png]
How fucked is my brain? I been smoking cannabis for twelve years every day, It hasn't impeded me to become an electronics engineer. During my college time I haven't smoked probably in two or three days. I could smoke 500 g of cannabis per month. I also started to study chemical engineering but I didn't finish it. Then I started to study master's degree in energy but this time I didn't only smoked I started to drink alcohol every day and started to take a cocktel of antidepressants and benzodiazepines because I tried to kill myself by carbon monoxide poisoning then because my girlfriend left me for my best friend. I suffered pulmonary thromboembolism ( I took every day 300 mg of bupropion, 150 mg of venlafaxine, 1 mg of alprazolam, 50 mg of Dipotassium chlorazepate, 5 mg of diazepam, 100 mg of trazodone hydrochloride and 10 mg of olanzapine ). Nowadays I take more or less a half of drugs and I almost no drink and smoke cannabis. I sleep for twenty hours and I awake for twelve hours but I'm still lerning I read the Cohen Tannoudji book's and I am also programming AVR microcontrollers, Java and Phyton. I hope to die soon because I owe the bank $ 40,000 for my education and I dont have a job. How is my brain?






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