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/sci/ Science & Math

Threads added between 2013/01/23 and 2013/01/30

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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)
3 more posts in this thread. [Missing image file: blackcrazyface.jpg]
Hey /sci/, I could use some help. Im failing calculus right now, and have a quiz tomorrow that could save my life, but have no idea what im doing. I have some practice problems and would really appreciate some help. Here we go, Water flows into a tank at a rate of dW/dt=(1/75)(600+20t+t^2) where dW/dt is measured in gallons per hour and t is measured in hours. if there are 150 gallons of water in the tank at t=0, how many gallons are there at t=24 I have to solve each problem twice, using each method once. first one would be the antiderivative method of plugging in/ solving for a constant and the second is something with f(b)-f(a) pic related, mfw i look at this problem
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
4 more posts in this thread. [Missing image file: 796279-wadsworth_large.jpg]
So a Neutron walks into a bar...
1 more posts in this thread. [Missing image file: 1358434323345.png]
Can you do it /sci/? Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 39 km away, 18° north of west, and the second team as 29 km away, 35° east of north. When the first team uses its GPS to check the position of the second team, what does it give for the second team's (a) distance from them and (b) direction, measured from due east?
3 more posts in this thread. [Missing image file: 1339273606425.jpg]
Chem friends I just took a chem exam and got raped, heres one of the questions I could not figure out. (1 Mol)Al melting point is at 933 K (and then it gave 10.7kJ, I dont remember what it was in reference too, most likely req energy). 1 Mol of Pb boiling point is at 600K and 3.77kJ. It then said both metals were placed in a furnace at 1000K, It asked which one has the largest delta S and what that delta S value was.

Brain Training i.e. Lumosity

1 more posts in this thread. [Missing image file: untitled.png]
Hello /sci/ I've been feeling a bit sluggish in the thinking area lately and I was wondering if brain training websites or applications are actually a good help, what experiecences have you guys had with these and if you could would you recommend me something
7 more posts in this thread. [Missing image file: latex guide.png]
I'm writing a homework assignment in LaTeX using LyX with the AMS document class. It seems to have defaulted to some really huge margins though, they're taking up like half the page. What is a sane size for margins when doing this kind of thing? or really when writing any math paper in latex. It's making my proofs kind of cramped.

Space-Time and Absolutey Nothing

10 more posts in this thread. [Missing image file: Spacetime.png]
How can space-time literally add to itself? Does it add to itself from nothing? Or? Or does it get it's space-time from the universe expanding? This would make the most sense to me because the universe is not nothing. So the universe expanding forms space-time? Or does space-time just keep stretching as the universe expands?
5 more posts in this thread. [Missing image file: 1357790983571.jpg]
What if black holes are portals to other dimensions? Say the extremely heavy neutron star doesn't "collapse" in on itself, but instead falls through the space-time fabric into a stronger field in a different dimension that can hold the mass of the neutron star, thus leaving behind a "black hole" or just a hole to the other dimension. You can think of the hole as a hole on a plastic platform that just broke from the weight of something. Of course the space-time fabric would work slightly different, but you get the point.
1 more posts in this thread. [Missing image file: original.jpg]
What are you studying /sci/? I'm currently doing a Physics (Particle) course.

Nanotechnology = pipedream?

4 more posts in this thread. [Missing image file: nanotech (1).jpg]
It seems like throughout my entire life I've been hearing that nanotechnology would change EVERYTHING. It is now blatantly obvious that nanotechnology has very little to no practical uses. Graphene is a new material that is getting almost as much hype as nanotech was getting although the 90s and 00s. Is Graphene just another pipe dream like Nanotech?+
2 more posts in this thread. [Missing image file: 0763774928.jpg]
http://www.jblearning.com/secureInstructorResources/Default.aspx?isbn13=9780763774929 Can any instructors or anyone request this solutions manual for me? I will pay $50.
4 more posts in this thread. [Missing image file: image.jpg]
Good Day, ubermenschen of /sci/ I'm building a CFD solver in C++ and have reached a point where I need to pass a very large matrix to a function for modification. If I require that this matrix not be replicated in memory, which of these do you advise I do: void function(const Matrix &m) {...} OR void function(Matrix *m)
4 more posts in this thread. [Missing image file: image-5[1].jpg]
Why don't lysosomal acid lipases hydrolyse the lysosomal membrane? Isn't the pH also 5-6 around the membrane?
33 more posts in this thread. [Missing image file: 1341155807655.jpg]
Imagine a facility where scientists could go to get unlimited funding. No ethical or moral boundaries. 100% privacy from the outside world. No red tape. No government. No religious leaders breathing down your neck. No 'laws' prohibiting scientists from research. What would the world look like if such a place existed? ....or do you think such a place exists already?
12 more posts in this thread. [Missing image file: io.jpg]
Io gets its internal heat from the friction caused by the gravitational pull between Jupiter and the outer moons. Does this mean that the gravitational pull will become weaker over time? What is "giving" here exactly?
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?
23 more posts in this thread. [Missing image file: Depositphotos_3709731_XXL[1].jpg]
Hi, /sci/. Why is diamond so incredibly thermally conductive?
17 more posts in this thread. [Missing image file: aceventura.jpg]
Are you contributing anything to science or are you just being lazy fucks /sci/






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