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/sci/ Science & Math

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Most viewed threads in this category

14 more posts in this thread. [Missing image file: 1362844602871.jpg]
Theres been this weird twitching going on with the middle of my forehead. Like involuntary muscle contractations. They just started today but have been becoming increasingly frequent to the point where if I think to much about it itll happen. Sometimes the base of my head right above the forehead will twitch too. I dont know if its observable but jesus i can feel it. It doesnt hurt, just slightly annoying. Anyone know what this could be? no /x/ shit please pic not related
66 more posts in this thread. [Missing image file: bio_home_page[1].jpg]
Biology is the most bullshit science, this includes medical science. They tend to make up more data than any other group of scientists because they are the least empirical. Read this: http://www.theatlantic.com/magazine/archive/2010/11/lies-damned-lies-and-medical-science/308269/ Engineers, chemist, and physicist can't get away with this kind of shit because all of their work is backed by empirical evidence. There are a lot less redaction and falsely published studies in other fields of science when compared to biology. That is because they do real science, and not just look at shit under a microscope, or count water buffalo. Biology should be considered a soft science. Furthermore shit is always changing in biology which is just proof that biologist don't know what the fuck they are doing. There are also very few laws in biology that weren't taken from physics, chemistry, or engineering. At best biology is somewhere in between a hard/physical science and a social/soft/bullshit science.
4 more posts in this thread. [Missing image file: chemistry-glassware.jpg]
Calculate the enthalpy change, in kJ, for the reaction: C2H4 +H2 -> C2H6, from the following data. C2H4 + 3 O2 -> 2 CO2 + 2 H2O H = -1411 kJ C2H6 + 7/2 O2 -> 2 CO2 + 3 H2O H= -1560. kJ H2 +1/2 O2 -> -> H2O H= -285.8 kJ Calculate the enthalpy change, in kJ, for the reaction: Ca + C + 3/2 O2 -> CaCO3, from the following data. Ca + 2 C -> CaC2 H= -62.8kJ CO2 -> C + O2 H= 394 kJ CaCO3 + CO2 -> CaC2 + 5/2 O2 H= 1538 kJ Calculate the enthalpy change, in kJ, for the reaction: 2 H2 + 2 C + O2 -> C2H5OH, from the following data. C2H5OH + 2 O2 -> 2 CO2 + 2 H2O H= -875 kJ C + O2 -> CO2 H= -394.51 kJ H2 + 1/2 O2 -> H2O H= -285 kJ Calculate the enthalpy change, in kJ, for the reaction: CS2(l) + 2 H2O(l) -> 2 H2S(g) + CO2(g), from the following data. H2S(g) + 3/2 O2(g) -> H2O(l) + SO2(g) H = -563kJ CS2(l) + 3 O2(g) -> CO2(g) + 2 SO2(g) H = -1075kJ
9 more posts in this thread. [Missing image file: theabaddon.png]
How do i make a dichotomous key in microsoft word? I went to ehow and it's telling me to go to format, i don't even know where format is.
8 more posts in this thread. [Missing image file: fa5.jpg]
chemfags, I'm working on a titration problem using a strong base and a weak acid A 40.0 mL sample of 0.100 M HNO2 is titrated with 0.200 M KOH. Determine the pH at the equivalence point for the titration. So I figured the amount of moles of base needed to reach equivalence is 0.004 moles, I added that to the initial moles bringing the number of moles of the conjugate base NO2- to 0.004 moles. Put that into molarity that's 0.004 moles/(0.0200 L + 0.0400L) = 0.06 M; then the pOH = 1.18 and the pH = 12.82. However the answer in the book lists the pH as 18.08. Can someone help me understand this better?
6 more posts in this thread. [Missing image file: spacecraft.jpg]
Proof the Voyager probes were a hoax: What we supposedly have are space probes that went to 4 outer planets and gathered and sent back thousands of images. This was done with mid-1970s technology. By today's standards the probes were crude: - Flight Data System had a 250 kHz RCA CD4000 processor with 16 kb of RAM [http://voyager.jpl.nasa.gov/faq.html] - Vidicon tube imaging cameras - 8-Track tape for recording data for re-transmission We know that the cameras had a resolution of 800x800 pixels [http://pds-rings.seti.org/voyager/iss/inst_cat_wa2.html#inst_det] and the probes had a maximum upload rate of 1.4kb/s [http://voyager.jpl.nasa.gov/spacecraft/index.html]. With 3 channel color images this means that each raw image was 14.64 Mb in size. Assuming no compression it would have taken 178 minutes (3 hours) to transfer each image. Which means either they had to compress the images somehow or the 8 track tape they used had to have the capacity of several gigabytes (remember this is the mid 1970s) which would later, slowly, re-transmit images. And if they did compress the images, how would they do it with the slow 1970s processor, it would have taken longer to compress than to actually transmit them?
3 more posts in this thread. [Missing image file: sil.jpg]
/sci/ I need help with this problem. "A closed rectangular box is to be constructed with a base that is twice as long as it is wide. If the total surface area must be 27 square feet, find the dimensions of the box that will maximize the volume." *My work so far* Length = 2L Width = L Height = H I have Surface Area(SA) = 2(2LH) + 2(LH) + 2(2L^2) = 27 But I can't get past this first step as I set up the problem and tips on how to proceed?
10 more posts in this thread. [Missing image file: french.jpg]
Pete, a professional bowler, is unhappy with any game below 200. Over time, 80% of his games exceed this score. What is the probability that Pete exceeds 200 in at least 9 of his next 10 games?

Shirts and Science

11 more posts in this thread. [Missing image file: 64000heatherpurple.jpg]
Men and women of science, Do you have any ideas for a shirt, for a science club. Funny, catchy, or witty preferably all three, I have not been able to come up with an idea!

Monty Troll Problem

5 more posts in this thread. [Missing image file: 1338863429263.jpg]
Before you are three doors. Behind Two of the doors is a goat, behind one of the doors is a Car. Each door is marked with a number. 1. 25% 2. 50% 3. 75% If you choose a door randomly to this question, what is the chance you will get it right after switching?
14 more posts in this thread. [Missing image file: sidereal.gif]
Astronomy guys, I need your help. I need some code for Matlab that converts local time to local apparent sidereal time, and an explanation as to how it works. I've tried composing my own, but unfortunately it won't work, and I'm completely stumped. Thanks.
29 more posts in this thread. [Missing image file: frodo2.jpg]
So it's mathematically proven that time travel exists. And the chance that someone built a time machine at some point in infinity is pretty high, too. Then we just happen to live in an unlucky timeline, where the time traveller never ends up?
2 more posts in this thread. [Missing image file: 626px-ATP-xtal-3D-balls.png]
Could you live off pure ATP? How much would you have to ingest per day/ how could you absorb it?
12 more posts in this thread. [Missing image file: logistic map.png]
Is mathematical biology a science?
63 more posts in this thread. [Missing image file: 6843657685463421.jpg]
Quantum mechanics or gtfo.
2 more posts in this thread. [Missing image file: thermo2.gif]
Some simple true or false, does /sci/ want to help? Evaporation is an exothermic process because the system gives off energy. Condensation is an exothermic process because the system gives off energy. The water in the system is undergoing a reversible process at 373K and 1 atm pressure. Under these conditions, both boiling and condensation may occur. The freezing of water is an endothermic process because the system absorbs energy. The melting of ice is an endothermic process because the system absorbs energy. Heating water is an endothermic process which increases the internal energy of the system. As steam condenses, the surroundings are absorbing energy from the system. My answers are: FTTFFTT
6 more posts in this thread. [Missing image file: 1346276766004.png]
Masters, I don't understand the 10 over 7 thing in this binomial probability formula. How do i calculate that? http://www.mathwords.com/b/binomial_probability_formula.htm
10 more posts in this thread. [Missing image file: tryptophan.jpg]
Trivial names > systematic names "anisole" > "methoxybenzene" "pyromellitic acid" > "1,2,4,5-benzenetetracarboxylic acid" "crotonaldehyde" > "but-2-enal" You know this to be true. Also, post your favourite trivial compound name so that we may all learn.
27 more posts in this thread. [Missing image file: Untitled.png]
Hello, /sci/. Been hitting this bitch with trial and error for a while now, and I'm inclined to say the answer is "no" based on just that. However, I'm sure there's an actually efficient mathematical way to approach this, but I just don't know it yet. Can anyone help? Thanks,
94 more posts in this thread. [Missing image file: 123332232.png]
So I decided to study engineering. I chose loosely based on this picture, of course it is only opinion of whoever made it but I think it's pretty true. How bad or how good did I choose? I was choosing between electronic, mechanical and computer sciences and informatics. The problem in our country is that there is not much information on what all this actually looks like so had I little idea on what I will do. Of course I checked on the internet and I have a picture in my mind but still. I'm asking for any advice, tips and information on engineering.

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