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/sci/ Science & Math

Threads added between 2012/11/21 and 2012/11/28

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Most viewed threads in this category

39 more posts in this thread. [Missing image file: matlablogo.jpg]
Holy fucking hell I hate this piece of shit. Why do I have to use it for everything, why can't I just do my shit in an actual coding language, fuck you shitty engineering program fucking fuck your errors mean NOTHING AT ALL.
8 more posts in this thread. [Missing image file: 1330101109454.png]
I have Concerta. Each pill is 54 mg. I know I'm not supposed to crush and consume it as it would release all the stimulant at once, but couldn't I divide the pill into like 6 parts and swallow 1 part? Pic unrelated.
19 more posts in this thread. [Missing image file: 11lrg8y.jpg]
What real numbers have multiple decimal representations and what real numbers have unique decimal representations? Do some real numbers have more than two decimal representations? Is it possible to describe the set of all real numbers that have multiple decimal representations? Pic unrelated. I didn't know what would be a suitable picture for this topic, so i just grabbed the first thing at hand.
1 more posts in this thread. [Missing image file: 1352697989662.jpg]
https://www.youtube.com/watch?v=bKLrj3UFqQI >Scotland in charge of physics
1 more posts in this thread. [Missing image file: heat-pump[1].png]
Help? exam review problem, cant get the right answer What is the maximum possible coefficient of performance of a heat pump that brings energy from outdoors at -3.00°C into a 20.0°C house? Note that the work done to run the heat pump is also available to warm up the house. i got 11.73 but that isn't correct, anyone know what I'm doing wrong? 270/(293-270)=11.7391 seems to make sense, but its not right
14 more posts in this thread. [Missing image file: 250px-Human_navel,_female.jpg]
Why is the navel sensitive? For that matter, why are in the inside of the wrist and the back of the knee? I know it's because they have lots of nerve endings there, but why? What purpose does it serve? With fingertips it's obvious, but not these.
2 more posts in this thread. [Missing image file: confused.jpg]
Hey, not asking for answers here, just how to answer if that is possible. "Using Excel, answer the following questions; 1. For loads between 200 N and 800 N, the graph of load (y) against extension (x) is approximately linear. Find the gradient and intercept of this portion of the graph."
18 more posts in this thread. [Missing image file: .99=1.jpg]
Does /sci/ have any more infographics? I only have two as of now
15 more posts in this thread. [Missing image file: ant.jpg]
On a 1m long, narrow stick there are n amount of ants. Every ant is walking towards both ends of the stick at a speed of 1m/min. If two ants collide, they will turn around and walk the other direction. If an ant walks to the end of the stick it falls off. How long do you have to wait to be certain that all the ants have fallen off?

POSIX extended regexes and sed

5 more posts in this thread. [Missing image file: Damn+now+I+wish+I+had+some+techno-v(...).gif]
Hey /sci/, I need hel with POSIX extended regexes and sed. I need to separate all lines in format X: X (note the space) and get it to form X. This does not work: /(\w*): \1/!d s/(\w*):// wat do? (example - line is 1000000009: 1000000009, I need to output 1000000009)
2 more posts in this thread. [Missing image file: 1352400023736.jpg]
The surface of a river is described as the part of the x3 = 0 plane, R = { x ? R3: x3 = 0 , ?b/2 < x2 < b/2 } where b > 0 is a constant. The water of the river ?ows with a location-dependent velocity vR(x) = w*(1 ?(2*x1)^2/b2)*e1 , where w > 0 is constant. An engine-driven boat sets out from the south bank (x2 = ?b/2) at x1 = 0, to reach the north bank (x2 = b/2) of the river. The boat (whose size and shape are assumed to be negligible) always points in the e2 direction and its velocity in this direction in the surrounding water is vB. (a) Sketch the river and the velocity ?eld vR in the x1-x2-plane. (b) Calculate the trajectory of the boat and the point where it reaches the north bank. (c) Sketch the trajectory of the boat on the river. Can I please get assistance with this one /sci/? Especially for part b).
15 more posts in this thread. [Missing image file: 405131_469986996375717_70433344_n.jpg]
what have you done to protect lord mother gaia today /sci/....?
0 more posts in this thread. [Missing image file: Wings.jpg]
Anyone familiar with organic chemistry in here? Why can't you make diphenyltin from tin (ii) chloride? I know you can synthesise tetraphenyltin from tin (iv) chloride with a grignard, but can't think of why it won't work with a tin (ii) chloride. Thanks.

IKEA prefabbed skyscraper

1 more posts in this thread. [Missing image file: sky city one.jpg]
What are the odds that this thing will actually be completed in 90 days?
36 more posts in this thread. [Missing image file: pb.png]
Any Ideas?
53 more posts in this thread. [Missing image file: photo.jpg]
Greetings /sci/. I come to you with a challenge: Either create or post an/your favorite obscure unit of measure. Some examples would be: a furlong - 1/8 of a mile a smoot - 5' 7" a mickey - ratio of computer mouse movement to onscreen cursor movement a jansky - strength of radio signals from space Or some made-up ones: a gokusecond - approximate time taken for anything to happen in the show Dragon Ball Z a squirrel - measure of the human attention span a howlong - an approximation of the time remaining before we get there Go wild, get creative, and have fun!
4 more posts in this thread. [Missing image file: Robeson, Paul (Emperor Jones, The)_01.jpg]
CHEATING GENERAL >tests >spent all day playing video games >I get up a little to look at another guys sheet >professor asks what I'm doing >"cheating" >get kicked out
2 more posts in this thread. [Missing image file: Wrong Neighbourhood.gif]
For use a double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval [0, 2pi] Any help /sci/ ?
19 more posts in this thread. [Missing image file: Untitled.png]
can one of you tell me how to do this? i'm going to fail physics ;_;
11 more posts in this thread. [Missing image file: wallpaper191602.png]
Which universities are best for studying physics. Hardmode: In Europe. My german is fluent and french okay so that won't be a problem. I'm considering ETH Zürich but all my friends say I should just move to USA if I really want the best possible education in physics. I only have interests on becoming a researcher.






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