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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: 1350062944985.gif]
is C2- not paramagnetic? I just got this question wrong on a test. I thought if it had unpaired electrons in its valence shell, it was paramagnetic, and if all electrons were paired it was diamagnetic. C2-'s electron configuration is 1s22s22p4 right? so there would be two unpaired electrons in the 2p orbital, right? why did i get the question wrong?
10 more posts in this thread. [Missing image file: Toast-3.jpg]
Hey dudes, General chemistry question. Not homework, just something I've been curious of for ages. I had a science teacher in high school who was explaining chemical reactions. He said that heat "always sped up reactions." Seemed odd to me to say that, still does. He used toast as an example, saying that heat "sped up the toasting of bread." But wouldn't this mean that the toast would, given enough time, just toast itself? The question is: is what my teacher said true, but unintuitive, or was he just using the wrong example? Is it true for most examples?
12 more posts in this thread. [Missing image file: ferrofluid-525[1].jpg]
Can you electrically charge a ferrofluid? Could you add particles to it to make it hold a current?
9 more posts in this thread. [Missing image file: 34567898765.jpg]
>Please state briefly why you wish to undertake the medical programme. Please include any professional and personal experiences, and other personal attributes that you feel are relevant. >Please describe any sporting, cultural, artistic and community involvements, leadership roles and other personal achievements that you feel are worthy of merit. Holy shit, what do I say? There's not much of a word limit on each (3000 characters each) but I'm really stumped for anything I could talk about. I've never had a job or done volunteer/community work. The only sporting things I've done would be signing up for squash and judo for a few weeks, but those didn't last long. This is a medical school application and there's an interview process that follows this so any bullshit I put in will probably be asked about.
14 more posts in this thread. [Missing image file: derp.png]
http://worldnews.nbcnews.com/_news/2012/10/22/14611225-scientists-found-guilty-of-manslaughter-for-f ailing-to-predict-italy-quake?lite >Being a scientist >2011 shiggy
4 more posts in this thread. [Missing image file: 1348645155773.png]
if f is continuous at a, and if f(a)>0, then f(x)>0. >Tell me whether this proof is correct? Set \epsilon>0 then there must exist a delta such that 0<|x-a|<\delta This means that 0<|x-a|<\delta \Rightarrow |f(X)-f(a)|<\epsilon since the \epsilon>0, then for the equality |f(X)-f(a)|<\epsilon is the same thing as -\epsilon<f(x)-f(a)<\epsilon, which is the same thing as -\epsilon+f(a)<f(x)<\epsilon+f(a) now, \epsilon+f(a)>0 due to our initial assumption. then, if \epsilon+f(a)>0, then the sum -\epsilon+f(a) will be positive. Thus, we are left with 0<-\epsilon+f(a)<f(x)<\epsilon+f(a) >does this make sense? is this a good proof?
3 more posts in this thread. [Missing image file: 4-53alt.gif]
Suppose two boxes on a frictionless table are connected by a heavy cord of mass 1.0 kg. Calculate the acceleration (magnitude) of each box and the tension (magnitude) at each end of the cored, using the free-body diagrams shown in Figure 4-53. Assume FP = 37.0 N, ma = 8.0 kg, and mb = 12.0 kg, and ignore sagging of the cord All i need help with is how to find FTA. pic related.

Physical properties of racemic mixtures

25 more posts in this thread. [Missing image file: racemicmixture.png]
Hey /sci/, This is a question for chemfags While reading through my Organic Chemistry text book, it said that a solution containing only one enantiomer of a particular chemical have different physical properties than a racemic mixture. The book basically said it was too difficult to explain why this is and didn't matter for the course, but I'm curious about why a racemic mixture would have different physical properties than either enantiomer by itself. Can someone explain this? Also, would a mixture containing an uneven amount of each enantiomer exhibit different physical properties as well? If so would the physical properties be intermediate between a racemic mixture and one enantiomer? For example: If a racemic mixture of A has a boiling point of 300K and a single enantiomer had a boiling point of 200K, would a mixture of 25% A(S) and 75% A(R) have a boiling point around 250K?
19 more posts in this thread. [Missing image file: Neil_deGrasse_Tyson_-_NAC_Nov_2005.jpg]
>http://www.wired.com/geekdad/2011/08/cosmos-to-get-a-sequel-hosted-by-neil-degrasse-tyson/ Hyped? y/n
21 more posts in this thread. [Missing image file: omnomnom.png]
Is race a natural taxonomic classification of humans?
21 more posts in this thread. [Missing image file: CrackedEarth.jpg]
If I knew the resonant frequency of the Earth could I crack it open?
3 more posts in this thread. [Missing image file: MurphyFeels.jpg]
>the perversity of the universe tends to a maximum >anything that can go wrong will go wrong >anything that can go wrong will at the worst possible moment
8 more posts in this thread. [Missing image file: Screen Shot 2012-10-31 at 11.31.43.png]
http://www.youtube.com/watch?v=4f0he7l8Wa4 Can anyone explain this? Just opened it and wouldn't stop coming out :D

Math question

17 more posts in this thread. [Missing image file: Tulips.jpg]
Hello /sci/. I have a simple math question and all I need is a quick "yes" or "no". Let (G, +) be a group. Let g_1 \in G and let g_2 \in G. Is it always necessary that (g_1 + g_2) \in G? Wikipedia says closure is a group axiom, but my teacher didn't include it in his lecture. I tend to believe wikipedia, but I have no idea and need reassurance. Thanks in advance.
10 more posts in this thread. [Missing image file: i'm cereal.png]
What does /sci/ eat in the morning? And is the best cereal, not necessarily in the morning, if you have a sweet tooth? I'm on the hunt for something new, don't let me down!
4 more posts in this thread. [Missing image file: Plasma-lamp_2.jpg]
So, I bought some mood lighting for my room. A light chain and a plasma globe, to be exact. The plasma globe has a function to turn on and off depending on the noise level, so you can use it with music in the background. I put on something with a beat, and discovered that the light chain placed near the globe, but not plugged in to anything, began to dimly turn itself on and off at the same rhythm as the plasma globe. Needless to say, I was surprised. I experimented with placing it in a circle around the globe on a table, and it still does it. Why the hell is that?
4 more posts in this thread. [Missing image file: question-mark.jpg]
Hey /sci/, quick question, is the following definition of divergence of a sequence correct? I'm studying for a calculus exam but none of the exercises i did have answers provided:( \lim_{n \rightarrow \infty}x_n=\infty \iff \forall_{n \in \mathbb{N} } \text{ } \exists_{N > n } \text{ for which } x_N > x_n I'm hoping it renders correctly too..
8 more posts in this thread. [Missing image file: 1337400186156.jpg]
I've got an interview today with one of my professors regarding getting on his research team. He does a lot of work regarding crystal growth and material defects. Any advice?
2 more posts in this thread. [Missing image file: fun.jpg]
ifmmp bopot, mfu't ibwf tpnf gvo. ofyu pof xjmm cf ibsefs.
0 more posts in this thread. [Missing image file: clio.jpg]
Those who came before us made certain that this country rode the first waves of the industrial revolutions, the first waves of modern invention, and the first wave of nuclear power, and this generation does not intend to founder in the backwash of the coming age of space. We mean to be a part of it—we mean to lead it. For the eyes of the world now look into space, to the moon and to the planets beyond, and we have vowed that we shall not see it governed by a hostile flag of conquest, but by a banner of freedom and peace. We have vowed that we shall not see space filled with weapons of mass destruction, but with instruments of knowledge and understanding...

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