/sci/ - Science & Math

Hey guys not very /sci/ or smart but I had a thought.
If the light you see from stars depending where the star is in the universe is old light as light takes time to travel.
Could you travel so far away from the universe that you could see old light planets that don't exist anymore?
If a planet explodes and from your position the light fades away could you theoretically move away from that position and the light would re-appear?

series n=1 to infinity

sqrt(n+1)/n^2+1

apparently no test works besides the direct comparison test on this problem. i don't know which integral to use.

Today in a special after class lecture my professor was discussing the Stern-Gerlach experiment and how if you have a well-defined Z spin then your X spin will either be plus or minus h-bar over 2 or something like that.

I was just wondering what it was about classical mechanics or w/e that suggests that a certain Z spin should have a certain X spin.

How the heck did my prof get this answer?

1 mol of TNT (RMM of 227, density 1.65 g cm^-3) occupies 137.6 cm^3.

I tried using pV = nRT, but no dice.

I have a question about the Goldbach conjecture.

Basically, it asks whether all even integers greater than 2 can be represented as the sum of two primes.

so, for some p,q, if p and q are prime, then for all n >= 2, p+q = 2n

so say n = 2, then p+q = 4, so p,q = 2, since 2 is prime

now lets say n > 2. since all other primes are odd by definition and the sum of two odd integers is an even integer, we can see that the sum of two primes is an even integer. Same works for subtraction.

Is it reasonable to claim that for some n and for some primes p,q, 2n - q = p? Has this been verified? Essentially I'm asking that if we take any even integer and subtract a prime less than the even integer, is the result a prime?

He does have a point OP. However, here's some food for thought though gentlemen.

http://endgametime.wordpress.com/the-awakening-quantum-mechanics-of-the-human-brain-and-consciousness/

I'm seriously considering enrolling into university for Mechanical Engineering (not underage). But I have on problem, I'm semi decent at calculus (mid 90s) but my chemistry and physics mark are at high 80s to low 90s.

Am I in good shape for engineering or no?
Also how is engineering life in general?

07734 = hello

Get rekkt m8889

A musical organ produces notes by blowing air onto a set of pipes that are open at one end and closed at the other.

What is the lowest frequency of sound produced by a pipe of length 10m?
(The speed of sound in the pipe is 320ms-1.

Thanks.

How can I find this fucking paper those chinese bastards, I can't find it.

Q. Ye, X. L. Wang, H. Y. Hu, D. A. Wang, S. B. Li and F. Zhou, J. Phys. Chem. C, 2009, 113, 7677; Q. Ye, X. L. Wang, S. B. Li and
F. Zhou, Macromolecules, 2010, 43, 5554.

I glanced at google and saw that blood type O is less likely to get pancreatic cancer than A, B, or AB. Also people with blood type O are not likely to suffer from heart stroke than the other groups. On the other hand blood type O carriers are more likely to develop some stomach or intestinat problems.

So my question is which blood type has the less chance for developing cancer? Google says almost nothing.

If you accelerate a particle that is at 0K, is it still at 0K or does it have a temperature since it is moving?

Post the most common stereotype of the kind of person for each major.
Like, Every math major is a know it all.

>inb4 women studies are cunts etc.

Howdy /sci/,

Im looking to get into solid state physics and am looking for a good textbook for self study. I really dont want to use Kittel's since i've always heard bad things about it. I wouldnt mind Ashcroft & Mermin but it does seem dated.

So my question is if my ultimate goal is to modern topics like superconductivity, graphene, carbon nanotube and simlare topics, is there a better more modern textbook to use or should i just use A & M and then another book for the modern shiznit.

Also, i dont want the book to skip any important math, i would like to see as many full derivations and proofs as possible.
Thanks /sci/

Hey /sci/, I need some of you to fill this out for my stats project. Thank you! :)
/s/FY6SX95
Just plug that into surveymonkey, and it should give you the survey. (it keeps thinking it's spam)

/sci/ is this correct?

T=((β-To)Vo)/(V-Vo)

I got it from

ΔV/Vo=βΔT

What are some ways the we as Humans have effected evolution?

does /sci/ feel like feeding my 400-level undergrad interest tonight? I say 400-level because typically that's when you're "comfortable" with proofs.

I'm in a proof-based advanced linear algebra class and we have to do a research project. I enjoy cryptography so I wish to do something with it. Enter NP=hard (prude cousin of NP-complete, of the famous P = NP family).

The subset sum problem (http://endotwikipediadotorg/wiki/Subset_sum_problem)) is an important problem in cryptography. It is considered NP-Hard:

"(...) given a set of integers and an integer s, does any non-empty subset sum to s?"

I'm specifically looking for papers about applying linear algebra concepts to the problem, but any NP-Hard/NP-Complete problem would be just as great.

Help /sci/ I don't understand Euler's function.

pic related, Euler's Function

Also you forgot that ^5 on your u

Hello channers, I have recently started a Mathematics degree at university and one of the modules that i must pass is called Topics in Pure Mathematics which covers; Logic, Group Theory, Proofs and Number Theory. After 2 weeks in classes I have not made any headway with the work and fear that I may fail the module which I would prefer not to do, so if there are any tips or highly recommended books that I could purchase i would be highly grateful.

(pic unrelated)
Thanks in Advance

I got a question to ask, what would be a "good" use of a voltage pike. As in, a voltage spike created intentionally for a purpose.

Any ideas?

Pic very much unrelated

Sup /sci/.

I kind of screwed around in my program (nanotechnology engineering @ uwaterloo) and I'm in my third year... with crappy marks. I'm hovering above a 70% avg and that really puts me at a disadvantage if I want to go to law/med school later on. Is there anything I can do in the future to increase my chances of getting in? I know I can boost my average over the next 3 semesters to 95%/semester but that will only get me to ~80% overall average. Med schools in Canada require a minimum of a 85% average... so I'd still be screwed. Could I possibly fast track another undergrad degree in ~2 years if I wanted to (after finishing engineering)?

hey /sci/ i'm working through a mathematical statistics book to familiar myself with probability theory

anyways, one of the questions is

Use the results from 1 to show that if B is a subset of A, then P(B) <= P(A) (hint: use P(A intersect B' >= 0, where B' is the complement of B)

From #1 we saw that if B is a subset of A then P(A) = P(B) + P(A intersect B')

Can say that P(A intersect B') is equal to P(A) - P(B) by #1? That way I can say P(A) - P(B) >= 0 and thus P(A) >= P(B)?