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/sci/ Science & Math

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Most viewed threads in this category

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.
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: 1349720886786.png]
Let A and B be n x n matrices such that AB is invertible. Prove that A and B are invertible. Give an example to show that arbitrary matrices A and B need not be invertible if AB is invertible. can you help, sci?
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: 220px-Moving_Pictures.jpg]
An asymmetric pyramid has a base in the shape of a kite, with the longer sides of the base measuring 150m and the shorter sides measuring 120m. The angle between the two longer sides measures 70 degrees. The angle of elevation of the top of the pyramid, as seen from the vertex between the longer and shorter sides, is 75 degrees. Determine the height of the pyramid and show your steps
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
41 more posts in this thread. [Missing image file: Linear_Systems-16.jpg]
An underdetermined system has an infinite number of solutions (more unknowns than equations). But what does it mean to calculate the least-squares solution for an undetermined system? Since there are infinite exact solutions, wouldn't the least squares solution be any one of them?
13 more posts in this thread. [Missing image file: dammit-science.jpg]
5 more posts in this thread. [Missing image file: 1348616441019.gif]
Can anyone get a degree in something like Chemical Engineering if they simply try hard enough? Or does it reach a point where only those with innate intelligence succeed? I feel pretty incompetent all the time, I don't want to sink all that time and money into something if I'm just too stupid to make anything of it.

math

1 more posts in this thread. [Missing image file: 132173056990.gif]
Oh dear god I am efing stupid... hay guyise I need some halp. does the equivalence of two definite integrals of imply the functions are equivalent? that is does /int f(x) = /int g(x) => f(x) = g(x) ? once again, definite integrals, don['t know how to latex those in... My intuition says yes but i'd rather not base anything on that.
12 more posts in this thread. [Missing image file: mother-of-god.jpg]
Is it true that integers are created with the empty set ? 1:= #{Ø} 2:= #{Ø,{Ø}} 3:= #{Ø,{Ø},{Ø,{Ø}}} ... Can anyone confirm or provide source ?
28 more posts in this thread. [Missing image file: background.jpg]
Is superior intelligence more of a trait, or a lifestyle choice? Is it something we are born with, through genetics, or is it a product of early lifetime experiences leading to a quest for knowledge?
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.
1 more posts in this thread. [Missing image file: baby2.png]
How do you explain it from a scientific point of view? If not aliens what could it be? http://youtu.be/bTqE805dhOE
1 more posts in this thread. [Missing image file: _64406858_skylon_takeoff1l.jpg]
http://www.bbc.co.uk/news/science-environment-20510112 We spaceplane now.
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."

Math

2 more posts in this thread. [Missing image file: Trekant.jpg]
Hello What is "a"? I know you can do it!
6 more posts in this thread. [Missing image file: imgFig1.gif]
P(A)=0.6 What's the probability that you pick exactly 10 A's out of a set of 20? By my logic, that would be as follows: [mathP($Exactly 10 A's out of 20$)= \frac{\binom{20}{10} \cdot 0.6}{20!} Can somebody please point out where my error is? I've played around with this on my free time for days (I have hardly any free time at all nowadays, so it's not that long), to no avail. I'm gonna go insane soon if I can't fucking solve this. Please help a guy out. Believe it or not, this is not homework. I'm gonna have to go AFK again, I'll be back in 4-16 hours depending on my workload for the day.
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
8 more posts in this thread. [Missing image file: 1353584409191.jpg]
Any video's on youtube that will blow my mind /sci/ ?






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