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/sci/ Science & Math

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Most viewed threads in this category

74 more posts in this thread. [Missing image file: TFES.jpg]
Prove that the earth is not flat.

AP Chemistry

1 more posts in this thread. [Missing image file: 1283738715789.png]
What advice can you give for AP Chem in general? Also I have a test on Buffers/Hydrolysis/Ksp/Titrations tomorrow.
8 more posts in this thread. [Missing image file: 8-3-13-Europa_full_600.jpg]
Let's say we go to Europa and we find a primitive, sentient race in that's perhaps just hitting their equivalent of the neolithic revolution. What would that race be like? What would it look like, what would they eat, etc. Would they build above the ice, on the seafloor, or perhaps free floating? Would they build at all? Try to justify all of your decisions, or at least as many as you can. This thread is entirely a just for fun, hypothetical thought game. Aaand..go
3 more posts in this thread. [Missing image file: gauss.gif.047.gif]
I have to test a 2D time-dependent Schrödinger equation solver. I need some ideas for simulations with known results. For now, I only initialized the system with a Gaussian wave packet and verified that it moves depending on the momentum vector and delocalizes with time: http://colin.net.pl/narf/gauss.gif But I need some exact tests. I know the width of the packet relative to time can be found by analytically solving the equation, but I don't have the skills to do so myself. Where could I find the solution for two dimensions (I found for one)?
0 more posts in this thread. [Missing image file: PickUpLines2.png]
What are the main methods of measuring the band gap energy in a material?

The Astronomy Picture of the Day

13 more posts in this thread. [Missing image file: rsz_seyfertsextet_hlaschm(...).png]
Seyfert's Sextet Image Credit: Hubble Legacy Archive, NASA, ESA; Processing: Judy Schmidt What will survive this battle of the galaxies? Known as Seyfert's Sextet, this intriguing group of galaxies lies in the head portion of the split constellation of the Snake (Serpens). The sextet actually contains only four interacting galaxies, though. Near the center of this Hubble Space Telescope picture, the small face-on spiral galaxy lies in the distant background and appears only by chance aligned with the main group. Also, the prominent condensation on the upper left is likely not a separate galaxy at all, but a tidal tail of stars flung out by the galaxies' gravitational interactions. About 190 million light-years away, the interacting galaxies are tightly packed into a region around 100,000 light-years across, comparable to the size of our own Milky Way galaxy, making this one of the densest known galaxy groups. Bound by gravity, the close-knit group may coalesce into a single large galaxy over the next few billion years. Tomorrow's picture: open space
8 more posts in this thread. [Missing image file: image.jpg]
A bag has 20 marbles... 6 red, 4 blue and 10 black. A marble is drawn 18 and not replaced.... What is the chance that the last two marbles are red??
2 more posts in this thread. [Missing image file: ams-usa-population-mine.png]
Why cant America?
7 more posts in this thread. [Missing image file: 1328386518488.png]
hey /sci/ do you think of transorbital accelerators are possible? not between stars but just within one system? what I am thinking of is a space highway that accelerates vehicles close to 1/10 of speed of light just for interplanetary travel would this work?
5 more posts in this thread. [Missing image file: 1381546684609.jpg]
Wow, guys, wow listen. What if the universe is smaller than the visible horizon of our observable universe? Think about it
10 more posts in this thread. [Missing image file: circle.png]
Hi mathematicians, I have a question! I'm looking for the formula for the probability of something. If I have a 16 sided dice and every time it lands on 1 I get a prize, the prize I get is determined by a 24 sided dice. Question one; What is the estimated number of rolls I would need to do in order to gain all 24 prizes (note that once a prize is gained, it remains on the dice, I can get the same one more than once) Question 2; Let's say I have n amount of different prizes, thus 24-n prizes left to obtain, what is the formula for working out the chance of rolling the 16 sided dice, getting 1 and then a prize I have not already gained? Sorry if I've not worded this very well, tried my best. Appreciate any input! I'm not in the state of mind to work this out right now.
15 more posts in this thread. [Missing image file: fransancisco.png]
How is it that an object moving at a constant velocity is in equilibrium? Why is it that in order for their to be a force, there has to be acceleration present? If a car moving at a constant velocity crashes into a stationary object, there is a measurable force acting on the object? What is force exactly, anyway?
6 more posts in this thread. [Missing image file: 552812157010212.jpg]
Is it possible to explain a phenomena by reducing it to smaller and smaller parts? Isn't some meaning lost in reductionism if you go too far? We can explain a disease in terms of its cellular and genetic parts but if we go to the atomic, sub atomic, quantum level the interactions become almost trivial and pointless. Could our explanation of matter suffer from this? Maybe going to strings and lower is irrelevant... Maybe consciousness can't be explained in terms of neurons and can only be explained in terms of experiences or subjectiveness... How do we know how far to reduce?

The nature of our universe

31 more posts in this thread. [Missing image file: untitled.jpg]
our universe is supposed to start from nothing. but how does it end? or would it have an end?
12 more posts in this thread. [Missing image file: dead-planet-earth.jpg]
Science begets technology which is only accelerating a mass extinction event and the inevitable death of planet earth.
9 more posts in this thread. [Missing image file: 1488249_554509767968770_2(...).jpg]
i take this bee's threat seriously. what are we doing to protect him?
16 more posts in this thread. [Missing image file: 20131001_205604.jpg]
Hey /sci/ so I'm trying to prove that the curvature of an ellipse varies monotonically on each of the arcs between the 4 points that lie on the axes. My ellipse is given by x=3cos(t) and y=2sin(t). Now I already have the curvature of the ellipse as a function of t. That's 6 / (9sin^2(t) + 4cos^2(t))^(3/2). And I have the values of the curvature whenever the ellipse crosses the coordinate axes ( it's 3/4 on the x axes and 6/27 on the y axes). Can someone here give me some idea of how to approach this proof? How would I go about showing that the curvature varies monotonically on each of the four arcs between the four points where the ellipse crosses the coordinate axes? Thank you.
2 more posts in this thread. [Missing image file: raw-broccoli-lg.jpg]
is there more benefits or more negatives to be vegetarian or vegan?
5 more posts in this thread. [Missing image file: 2spook4u.png]
Is it true the human eye can't see higher than 14 or 16fps? How come there's a notable difference between 30fps and 60fps video games?
6 more posts in this thread. [Missing image file: gradeschoolconfidential6_thumb.png]
ITT: your favorite teacher. identify them by initial, what they teach, and why they are your favorite.

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