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/sci/ Science & Math

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Most viewed threads in this category

7 more posts in this thread. [Missing image file: 51cwd2m07uL._SL500_.jpg]
Does anyone have a pdf-version of this book? "Foundations of Astrophysics - International edition" by Ryden, Barbara and Peterson, Bradley M. (2011)
12 more posts in this thread. [Missing image file: 9gAdk.gif]
Programming question. Just looking for a little guidance. It's in Java. The problem is a de Jager formula, which is w^a \cdot x^b \cdot y^c \cdot z^d You choose any number you want, call it "mu", then you personally choose four numbers, variables w x y and z. The formula asserts that for exponents a b c and d, each can be any number from the array {-5, -4, -3, -2, -1, -1/2, -1/3, -1/4, 0, 1/4, 1/3, 1/2, 1, 2, 3, 4, 5}, can optimize a b c and d to come within 1% error of your randomly chosen initial number mu. I'm not looking for an explicit answer, I just want to make sure I'm not on a fools errand with what I've done. Basically, I've used four loops nested within each other to keep generating a new product using every value combination possible, then if the error of that value is less than the error of the previous value s then that's the new error and that value becomes the new best value. It's not returning the right, optimized value right now. Any insight? Pic related, how I don't feel right now programming
50 more posts in this thread. [Missing image file: Richard_Feynman_Nobel.jpg]
"In this moment, I am euphoric. Not because of some phony God's blessing. But because, I am enlightened by my intelligence." --Richard Feynman Discuss
4 more posts in this thread. [Missing image file: tumblr_kq979vR0Hz1qzma4ho1_400.jpg]
>Feathered Dinosaurs
12 more posts in this thread. [Missing image file: water .jpg]
> what's the opposite of greatest common divisor? define the integer g=gcd(a,b) whenever ( g|a and g|b ) and { ( c|a and c|b ) then ( c<=g ) } Let's consider the set of integers ~g ~g = ~gcd(a,b) = ~ [ ( g|a and g|b ) and { ( c|a and c|b ) then ( c<=g ) } ] = ~( g|a and g|b ) or ~ { ( c|a and c|b ) then ( c<=g ) } = ~( g|a and g|b ) or ~ { ( c<=g ) or ~( c|a and c|b ) } = ~( g|a and g|b ) or { ~( c<=g ) and ( c|a and c|b ) } = ~( g|a and g|b ) or { ( c>g ) and ( c|a and c|b ) } = ( g~|a or g~|b ) or { ( c>g ) and ( c|a and c|b ) } g doesn't divide a or b, but there is a c greater than g such that c divides both a and b? is the part in { } telling me that there exists a greater common divisor?

sorryinadvance.jpg

4 more posts in this thread. [Missing image file: 3525859742_bd86e015c22.jpg]
Pleading for help here. Since i have not a calculator and my schooling is sub par. Can anyone throw me an answer to this question? Which expression represents the third term in the expansion of (2x^4 - y)^3? Much appreciated.
15 more posts in this thread. [Missing image file: cppvideoseries2db.png]
I am about to go into college, and I've never programmed anything other than basic Java. I want to go into Computer Programming. Is this a good idea?
39 more posts in this thread. [Missing image file: funfacts_pi.png]
The sequences of digits in Pi have so far passed all known tests for randomness. The Pi memory champion is Hiroyoki Gotu, who memorized an amazing 42,000 digits. If you take 10 million random digits, statistically on average you would expect 200 cases where you get 5 digits in a row the same. If you take 10 million digits of Pi, you get exactly 200. It is impossible to 'square the circle'. I.e.: You can't draw a square with the same area as a circle using standard / Euclidean straightedge and compass construction in a finite number of steps. The Greeks were obsessed with trying to do this. At position 763 there are six nines in a row. This is known as the Feynman Point The sequences of digits in Pi have so far passed all known tests for randomness. The first million decimal places of pi consist of 99,959 zeros, 99,758 1s, 100,026 2s, 100,229 3s, 100,230 4s, 100,359 5s, 99,548 6s, 99,800 7s, 99,985 8s, and 100,106 9s. There are no occurrences of the sequence 123456 in the first million digits of pi—but of the eight 12345s that do occur, three are followed by another 5. The sequence 012345 occurs twice and, in both cases, it is followed by another 5. Thirty-nine decimal places of pi suffice for computing the circumference of a circle girding the known universe with an error no greater than the radius of a hydrogen atom.
6 more posts in this thread. [Missing image file: muricca.png]
How many hamburgers does an American have to eat so that he will collapse into a black hole? The average hamburger weight is 4oz.
7 more posts in this thread. [Missing image file: mark.jpg]
What sort of skin blemish is this /sci/?
1 more posts in this thread. [Missing image file: Mn.png]
Can you electolyze manganese in water?
50 more posts in this thread. [Missing image file: purity.png]
Is this true, Sci?
2 more posts in this thread. [Missing image file: circular.png]
hey sci this question has confused me so please offer some quick advice The question involved finding the tension in this string as a particle on the end was moving round in a circle. I resolved along the line of T and got this ewuation T - mg/(cost(theta)) = (mv^2)/r However the answer solutions says that you use T - mgcos(theta) = (mv^2)/r clearly the difference is in the two different triangles used in the picture, what I want to know is how am I supposed to know how to set up my triangle as both ways make sense yet yield different results
4 more posts in this thread. [Missing image file: Clipboard01.jpg]
Can an anon knowledgeable in chemistry explain this Dexter's Laboratory joke to me? http://www.youtube.com/watch?v=bJGItzuFkEM Is it something about the physicist's wife being drunk?
7 more posts in this thread. [Missing image file: acidfish.jpg]
Could life evolve in a lake of LSD?
5 more posts in this thread. [Missing image file: 1313106496677.png]
Does a lack of oxygen in the atmosphere have an effect on color film?
4 more posts in this thread. [Missing image file: fix_gov.jpg]
Does anyone know where I can find some place to find nursing textbook torrents?

Dyson Sphere Thread?

45 more posts in this thread. [Missing image file: 220px-Dyson_Sphere_Diagram-en.svg.png]
http://en.wikipedia.org/wiki/Dyson_sphere When, /sci/?
3 more posts in this thread. [Missing image file: url.jpg]
is it possible to engineer a real life blastoise? tell me how pls.
0 more posts in this thread. [Missing image file: 56L4ONm.jpg]
Unintentional capacitive coupling sounds a lot like inductive coupling. They are apparently different but I can't see why. Could anyone enlighten me






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