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/sci/ Science & Math

Threads added between 2012/10/24 and 2012/10/31

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Most viewed threads in this category

6 more posts in this thread. [Missing image file: phase.gif]
I understand the concept of enthalpy, however this question is throwing me off for some reason. Calculate the energy require to convert 1.70g of ice originally at -12.0°C into steam at 105°C. I dont really know where to start. I know the graph of phase transition has slopes for the heating of water, and a straight line for the actual phase change. Do I calculate E from each part from -12°C to 117°C, including the slope and plateaus?

Enthalpy problem

25 more posts in this thread. [Missing image file: 121012_0000.jpg]
I'm stuck on a problem and wouldn't mind some help: "The sun supplies energy at a rate of about 1.0 kilowatt per square meter of surface (1watt=1J/s). The plants in an agricultural field produce the equivalent of 20 kg of sucrose(C12H22O11) per hour per hectare (1 ha = 10,000 m2) Assuming that sucrose is produced by the reaction 12CO2+11H2O ---> C12H22O11+12O2 Change in enthalpy = 5640 kj Calculate the % of sunlight used to produce the sucrose." So far I've gotten: 1kW/m^2= 1000J/s 20,000g/342.01= 58.5 mol C12H22O11 I'm not sure about how to go about the hectare conversion....does it matter that it's per hour and that rate I already determined is per second? Or are they unrelated? Thanks in advance
4 more posts in this thread. [Missing image file: 1351464017314.jpg]
Anybody else consider using Anki for their classes?
22 more posts in this thread. [Missing image file: 69370_444545252260051_753064282_n.jpg]
Saw this on facebook, wondering how I should kill myself.
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?
9 more posts in this thread. [Missing image file: Dodo_bw.gif]
can anybody explain this "3 species on earth go extinct every hour" idea? is this true? it seems impossible. it seems like eco-freaks are bending facts. i understand that we overhunt, but one species every 20 minutes? it just seems ridiculous.
26 more posts in this thread. [Missing image file: ryQaj.png]
if scientist are smarter than engineers than why is engineering known as the hardest major in college?
1 more posts in this thread. [Missing image file: 0000044502_20071129151044.jpg]
turning on the stream and passing out... http://www.livestream.com/mahaschannel
2 more posts in this thread. [Missing image file: PitchFrameLPC.png]
Hey guys, so I am working on my senior design project. It is a speech recognition program. And currently I am trying to figure out a way to do pitch extraction from a speech signal. The problem is that I am no good at coding, and I got kind of roped up into this project against my wishes, so I am really struggling here. The whole concept of pitch extraction is too abstract for me and a simple google search doesn't really give me enough direction. I was wondering if you guys had some advice of where I could start in creating this program, or some resources I could use. Anything that could help me would be amazing.
1 more posts in this thread. [Missing image file: cirno.jpg]
Why do we experience time through out the daily life? Even when doing similar things, our experience of time can be radically different. For example, sometimes when we I try meditating for about 15(or 10/5) minutes, the event feels so long. However when I am playing a game or reading books for hours, it feels very short. Whats the deal here?
9 more posts in this thread. [Missing image file: Aurora_borealis.jpg]
Hey, I'm writing some code in C, and I was wondering if there is a way to use an and statement in an if statement. i.e: if ( 1 == 1 and 0 == 0){ blah blah blah} It says it expects the ")" before and, is there any way to do this or do i need to use two if statements?
20 more posts in this thread. [Missing image file: IMAG0201422868160.jpg]
Scibros, what's your weapon of choice? pic related.

Trident Replacement

4 more posts in this thread. [Missing image file: trident.jpg]
UK is talking about what to do when Trident becomes too old to work, it needs replacing, or binning. Lets assume we are going to replace it because we really hate hippies. Assuming that I want a new nuke solution. It must be: >Able to retaliate even after the UK has been turned into glass >Turn a mean sized and populated state into glass without fear of weapons being intercepted >Cost as little as possible What would sci suggest?
4 more posts in this thread. [Missing image file: wtf.png]
Help me /sci/, you're my only hope. >inb4 homework
12 more posts in this thread. [Missing image file: 1350233432302.jpg]
What are your study habits like, /g/? I got a test back today. 62%, and it was only even that high because the prof likes to give a lot of partial credit. I expected as much anyway. I haven't studied at all, and I've been skipping class a lot. I really have no excuse since I have 0 responsibilities outside of my schoolwork. tl;dr how can i re-develop the work ethic i had in high school
25 more posts in this thread. [Missing image file: 679px-Mvt2.svg.png]
Hey /sci/ kinda need some help here: How can you prove that if a polynomial has n roots (being n the highest degree), f '(x) has n-1 roots. I know it is very simple, and it can be proven using the fundamental theorem of algebra but how can I prove it using mean value theorem? I have seen this excersice in about 4 or 5 books with any answer on them. This is a Calculus 101 excercise and I can´t even think on how to do it. >feelsbadman.jpg
12 more posts in this thread. [Missing image file: denver.jpg]
Can /sci/ solve this problem? Show that (dC/dP)t = -T(d^2 V/dT^2)p Pic unrelated
6 more posts in this thread. [Missing image file: 5464235457.gif]
Does IQ measure intelligence or wiseness? I think it measures wiseness. I have high IQ and I think I'm smart but not so intelligence. For example I realise and notice things faster than others while my grades at school were always average. I've seen this with other people too. Why is it called IQ test then? Off-topic discussion: Your IQ?
7 more posts in this thread. [Missing image file: 1264316585904.gif]
I know /sci/ hates homework but i also know you like to solve problems, so i've decided to risk your wrath. "I have a large number of stamps to the value if 5d and 17d only. What is the largest denomination which i can not make up with a combination of these two different values?" Help, please. Oh, and just an answer is not very useful if you don't explain how to get the answer. Also, 'd' is apparently the old abbreviation for the Brittish 'penny'.






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