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/sci/ Science & Math

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Most viewed threads in this category

4 more posts in this thread. [Missing image file: lewis.gif]
How would I draw lewis structure of [NO4]3-, with the lone pair electrons, and with the formal charges minimized? NO4 3- Have been stuck on this question for over an hour.
12 more posts in this thread. [Missing image file: woof.jpg]
Calculate the mass of H2O required to react completely with 5.0 g of SiCl4: SiCl4 + 2H2O -> SiO2 + 4HCl I saw this problem online and the answer is given, but not the steps. Anyone wanna show the steps? Here is another one which seems slightly harder, well only harder because I don't know where to start. Lead (IV) oxide reacts with concentrated hydrochloric acid as follows: PbO2(s) + 4HCl(aq) -> PbCl2(s) + Cl2(g) + 2H2O(l) What mass of lead chloride would be obtained from 37.2g of PbO2, and what mass of chlorine gas would be produced?
7 more posts in this thread. [Missing image file: DIEL.jpg]
What on earth is this symbol ? For a genetics assignment we need to calculate the DNA profile probability of some samples, and the formula given is DPP=?p^2 x ?2pq Any help?
5 more posts in this thread. [Missing image file: testbed.png]
Okay, /sci/, /g/ were unable to help me. What am I doing wrong? I'm not getting the expected throughput. >tl;dr When I have 4 flows, they all get an average of 250 kbit/s each (16 flows, I get 1000 / 16 etc.), but with only one flow I never get more than ~360 kbit/s. Why is that? <-- Pic is my set up I have a sender, two bridges and a router. On the outgoing interface on the router (eth2), I've capped the bandwidth to 1000kbit. I'm using netem on one of the bridges to create a 50 ms delay each way, so that the RTT is 100ms. I'm using iperf to send from the sender to the receiver, but I get the same result when I use other programs to stream with. I've also tried changing the queue size (tried both 9 and 17 packets), but same result. Output from tc: root@router:~# tc qdisc qdisc mq 0: dev eth0 root qdisc pfifo 800d: dev eth1 root refcnt 2 limit 17p qdisc tbf 1: dev eth2 root refcnt 2 rate 1000Kbit burst 1540b lat 0us qdisc pfifo 800e: dev eth2 parent 1: limit 17p root@bridge1:~# tc qdisc qdisc mq 0: dev eth0 root qdisc netem 8008: dev eth1 root refcnt 9 limit 1000 delay 50.0ms qdisc netem 8007: dev eth2 root refcnt 9 limit 1000 delay 50.0ms qdisc mq 0: dev eth3 root
2 more posts in this thread. [Missing image file: Dr Kleiner--article_image.jpg]
Let's see. The massless field-flux should self-limit and I've clamped the manifold parameters to CY [1] base and LG [2]? orbifold [3], Hilbert inclusive [4]. Conditions could hardly be more ideal. [1] http://en.wikipedia.org/wiki/Calabi–Yau_manifold [2] http://en.wikipedia.org/wiki/Orbifold [3] http://en.wikipedia.org/wiki/Ginzburg–Landau_theory [4] http://en.wikipedia.org/wiki/Hilbert_space
1 more posts in this thread. [Missing image file: 1349373748808.gif]
Did any of you faggots come to Cairns for the eclipse? Cairns local here, fuck you if you did, I was late for work this morning because of you. [spoiler]it was really neat to watch though[/spoiler]
7 more posts in this thread. [Missing image file: 1324795424919.png]
So i'm in a casual, albeit heated, debate about the origin of talent in humans, specifically musical talent. The issue is not whether it's a learned or genetic trait, and frankly I don't care which it is, nor if it's a combination there of, but the person I've been arguing the matter with claims that it's sometimes a learned trait, but chiefly not genetic nor learned in origin, but ALSO refuses to say that there's a third source. Am I missing something here, /sci/? Is there some source of human variable that's not internal (genetic) or external (learned) that I'm not considering? Obviously any undetectable sources that could be asserted, such as origins in the "soul" are not admissible. I remember my developmental bio and psych fairly well, and I'm pretty fucking sure that's all as far as where (musical) talent could come from. Input? The person I'm debating against has given no proof (do they ever?) that there are influences other than genetic or learned. Pic unrelated,Ii'm just usually from /k/
0 more posts in this thread. [Missing image file: RLcircuit.gif]
Does anyone have tips / a link to a website to help me solve circuits? Not the one like in the image here, it's easy. I have trouble, though, when you get a lot of strange loops in a circuit. Multiple batteries, resistors, capacitors, etc, in complex patterns. I know you do some things with loops, like if you start at one point and come back to it the voltage must add up to 0, things like that, but I guess I just need practice solving them. Any links to a site or something where there's abundant practice problems? Preferably it also includes problems where you do things like calculate it at t=0, solve it as t approaches infinity, then remove the battery or something so the current then relies only in the capacitor, things like that. Thanks!
3 more posts in this thread. [Missing image file: 1349437231329.jpg]
A factory produces plate glass with a mean thickness of mu = 4mm and a standard deviation of sigma = 1.1 mm. For quality control, a simple random sample of n = 100 sheets of glass is to be measured, and the sample mean thickness (i.e., x-bar) of the 100 sheets is to be computed. The Central Limit Theorem Question: For the factory described above, what is the probability that the average thickness, x-bar, of the 100 sheets of glass is less than 4.1 mm? That is, find P(x-bar< 4.1). 0.3183 0.5362 0.9091 0.8186 0.1814
2 more posts in this thread. [Missing image file: 28.jpg]
Are calculus and number theory the most integral fields of mathematics? (See what I did there?)

Latex

22 more posts in this thread. [Missing image file: latex.png]
good evening /sci/ i want to be able to make gorgeous latex, but after a few google searches my question remains unanswered... how the fuck do i begin a latex code here? is it \ documentclass {article} \ begin {document} (without the spages after the forwardslash, of course) any help in the matter of leaving the pleb tier of latex coding would be appreciated
59 more posts in this thread. [Missing image file: gfiuews.jpg]
What do these fine men and women over here at /sci/ have to say about this?

0/0

3 more posts in this thread. [Missing image file: tech-desktop-backgrounds-4.jpg]
I'm sure this has already been done, but what is 0/0? I personally think that it can equal any real number, but some people would say it's 1 or 0 ect. Pic unrelated

Black holes

16 more posts in this thread. [Missing image file: hole.png]
Hey /sci/, Layman here, What do you suppose were to happen if a black hole came into contact with another black hole?
6 more posts in this thread. [Missing image file: top-10-james-bond-movies_flash.jpg]
James Bond has a 1st in oriental languages he got from Cambridge in stead of STEM. Would you tell James Bond he has a useless degree?
22 more posts in this thread. [Missing image file: 2nd Grade Math.png]
EXAMPLE: 1000 - 23 I forgot all my math from before 2nd grade. Show me how to solve. I know the answer, but I need to know how to solve by hand. Why is life so hard?
5 more posts in this thread. [Missing image file: Coulomb.jpg]
Hi, I have a math question for you. Cant understand how to begin to solve this.. ''Electrolysis of aluminum takes 40 million coulombs to draw out 3.7kg Al. What must the current be to do it in A one minute and B one hour?'' Is this question impossible to solve due to lack of other factors?? it is a total mindfuck for me. I know that 1c = 1 ampere per second.. Can anyone please help?
11 more posts in this thread. [Missing image file: 3-1213191960-me-thinking-hard-about(...).jpg]
Hi /sci/ (picture not related) So i was thinking how many amazing things one simple cell can do with some time. But then a question poped out in my head. Were did the first cell come from? anyone got a clue?
27 more posts in this thread. [Missing image file: weierstrass.gif]
Hi guys, I have a math problem for you. I was unable to solve it, and the submission deadline has already passed (this is for a Calc I class), meaning I won't get credit for it - so don't worry. The professor won't point me in the right direction, and I do want to know the answer as it's the only special problem I couldn't solve. Here goes. Find a real-valued function, f, with domain [0,1] such that: - f(0) < f(1) - f is continuous - For all a and b, where 0 < a < b < 1, f is not increasing on [a, b].
3 more posts in this thread. [Missing image file: 3.gif]
I once failed a course. 50% of the grade from cases counted for 5.8 out of 10. the other 50% test grade counted for 4.5 out of 10. the average was 5.2 out of 10 rounded up. (needs 5.5 to pass) I follow the same course this semester however the grading has changed. 20% of the grade from cases 80% of the grade now counts for the test. Imagine in this new situation i would not do the test(unwise) and my test average remains a 4.5, what grade do i need for the other 20% as to reach the same insufficient grade of 5.2 on average?






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