Carbon Definition and 497 Threads

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

Hello. I need a help again for my differential equations class. The problem is as follows: The air in a room whose volume is 10,000 cu ft tests 0.15% carbon dioxide. Starting at t=0, outside air testing 0.05% carbon dioxide is admitted at the rate of 5000 cu ft/min. (a) What is the...

I am starting to learn how to make carbon fiber products i am not sure about what type of resin/epoxy? to use does the resin/epoxy give it that nice exterior? or is something else needed? any suggestions in general would be much appreciated thank you

What could those two things have in common? Vela-X exploded some 11,000 years ago. How do we know that 11,000 years, was it carbon dated somehow? Because if so then the calibrated date to calendar years would have been 13,000 years. Could that have caused a significant increase in cosmogenic...

The hydrogen liberated at the cathode would coat the electrode so polarises the cell. And manganse (IV) oxide is used as a depolariser. I got an equation in my notes: 2MnO2 + 3H2 --> 2MHO(OH) + 2H2O. But evidently the oxygen doesn't balance. I tried looking on the internet but still no...

Ques: If 6g of pure carbon is completely burned, what mass of carbon must be burned to furnish 39.3 kj of heat? For this ques, the equation would be C + O_2 \xrightarrow~ C O_2 well, iam stuck after this

Hey all Why does Silicon Dioxide have a Giant molecular structure, while Carbon dioxide is made of simple molecules? They both have 4 electrons on their valence shells, so why wouldn't Silicon Dioxide be a simple linear molecule? (gaseous).

Hi All, I was reading about carbon nanotubes on wikipedia and they seem to be a pretty interesting development. Wikipedia indicates that they are using in producting better electron guns, and I was wondering if anyone knew how they are being used to do so. My unserstanding of current...

carbon filament in a light bulb does obey the ohm's law right?

Hi! Is silicon inert? i.e. can I clean it from deposited films with e.g. HNO3 and H2SO4 without etching the silicon itself? What about amorphous carbon?

Hey there. I was browsing a motorcycle forum and stumbled upon a particular place where the moderator was in the process of selling his own manufactured "carbon fiber kits". Naturally I asked him if the people who designed those replacement parts had any engineering background, and if he had...

(I'm not a material engineer so I apologize if any part of this post is idiotic.) The main problem with carbon nanotubes is the difficulty with growing them long enough to be of any use. After doing some research, I found a site about carbon nanotube rings. So it got me thinking, why not...

Cubane is a hydrocarbon with the formula, C8H8. It has a cubic shape, as its name implies, with a carbon atom at each corner of the cube. This molecule is very unstable and some researchers have been seriously injured when crystals of the compound exploded while being scooped out of a...

Im looking to have several gas powered scooter parts made in carbon fiber from a cad file. Such things as steering pole, rims, deck, air scoop, and a distant goal of a frame. scooters in question www.goped.com. I understand some basics of carbon fiber, but pretty much just what you can learn...

Is it possible to maintain pure carbon gas at room temperature? Suppose I start with a vacuum chamber and allow a small amount of hot, gaseous carbon vapor inside it, but only enough so that it remains gaseous at normal room temperatures - is that possible to do? Where can I find formulas to let...

:cry: Does anyone know the resistivity of pure carbon??I’m doing a coursework n am stuck :cry: ..please help…loadsa lovin,G :blushing:

Lets say for example a hydrocarbon skeleton has two diff functional groups branched to the skeleton.. Let's say one of the functional groups pH is less than 9 to 10, and the other functional group's pH is greater than 2 to 4 that means that molecule to be electrically charged, the pH of the...

What is the mass (in grams) of 6.022 x 10^6 atoms Carbon 12? I am given the equation 1 amu=1.6606 x 10^-24 g, but I'm not sure if I should be using this in my conversion factor or not. Can anyone tell me how to set this up? I have a few ideas but unfortunately I don't have any way to check my...

Pipeline To Space? A carbon nano tube pipeline from the Equator to geo. orbit could pump massive amounts of H2 and O2 to space to be stored as rocket fuel. The pipeline would only have to be 1/4 inch diameter. http://www.newmars.com/cgi-bin/ikon...;f=5;t=198;st=0

I'm looking for information on the maximum possible strength of SWNTs. What effect do thermodynamically inevitable(over macro scale lengths) lattice faults have on the tensile and compressive strength of the tubes? What effect does tube chirality and diameter have on tensile and compressive...

can anyone please provide me all the excited levels of Carbon 12 upto 22.6 MeV at least with jpi descriptions? Thanks in advance.

A proton of mass m undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12×m. The initial velocity of the proton is 790 m/s in the positive x direction. Find the velocity of the center of mass of the system. I am really confused as to how to find the 'velocity of...

We did an experiment in chemistry class today, where we had to see whether certain substances dissolved in water conducted electrcity. For this we put carbon electrodes in the liquid and connected them, but that's not important. My question is, how did the carbon conduct the electricity? From...

http://www.eurekalert.org/pub_releases/2004-09/uoaf-asf092404.php

Hi I can't figure out the structure of a seven carbon alkene that has a stereogenic center (chiral center) and is known to be optically active. The structure which comes to my mind is apparently not the one that is correct...any suggestions would be greatly appreciated. Thanks and cheers...

I am reading an old book about Carbon Dating and it is really boring, I dstill havenot found out there is anything interesting for me to keep going with time continuum, continuum continuum, again and again...So would you please introduce me some (old or new) interesting books on the topic for me...

http://www.quantum.univie.ac.at/res...matterwave/c60/ This weblink is about C60 buckyballs passing through a diffraction grating and showing wave-like behaviour.Since the buckyballs are moving quite slowly - about 210 m/s would it be possible to fire a neutron beam through the buckyballs...

Carbon fibre is used in formula one cars to decrease load and increase aerodynamics. Is there a bearing which also works in a similar means ( re: light weight, as strong as current auto specs)?

http://news.nationalgeographic.com/news/2004/07/0715_040715_oceancarbon.html

what is meant by anomeric carbon atom

hello everybody, i want to ask about the indirect bandgap in carbon nanotube, how its look like? is there any article, literature or links about that? and i will be very glad if anybody can answer this. thankyou

Why does Carbon 12 in dead tissue ''remain'' undisturbed?

Carbon14 has a half life of 5730 yrs. This is the only information i am given. Caluculate the decay constant of Carbon 14. This is what I have done. dN/dt = -lambda(N) I know the Avogadro Constant is equal to 6x10^23 So i am using 1kg in my formula. 14C = 6 x 10^23 x 1000/14...

Recently in Chemistry we have been doing about how it is possible to identify carbon compounds by how many proton environments there are around a molecule. For this we look at graphs with various peaks dotted around them, this is not what bothers me, what bothers me is that some of these peaks...

Carbon Catastrophe... Carbon dioxide, mostly from burning of coal, gasoline and other fossil fuels, traps heat that otherwise would radiate into space. Global temperatures increased by about 1 degree Fahrenheit (0.6 degrees Celsius) during the 20th century, and international panels of...

I'm still a little confused about crystals and grains. Does a crystal become a grain as the metal solidifies? I'm also not clear on molecules. For instance with a body centered lattice you have nine atoms. One on each corner and one in the center of the body. So within that lattice -- what...

The current understanding of palaeo climate is fundamental for the current views on climate mechanism. One important part in that is using the stable isotope ratios, mainly of 18O and 2H or deuterium. We have registered those in the ice cores of Greenland and Artarctica as well as in the oceanic...

A proton of mass m undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12m. The velocity of the proton is 395 m/s in the positive x direction. The velocity of the center of mass of the system is 30.38 m/s. What is the velocity of the proton after the collision?

Hi, I have a question CH3, doublet (one unpaired electron) has a triangular planor shape. According to vspr theory it should have a tiangular pryimidal shape. The rest of the elements in row 14 ( Si, Ge, Sn, Pb) all have a tringular pryimidal shape. From what i understand, in carbon which...

The Odd Shapes of Life ( carbon) Hi, I have a question CH3, doublet (one unpaired electron) has a triangular planor shape. According to vspr theory it should have a tiangular pryimidal shape. The rest of the elements in row 14 ( Si, Ge, Sn, Pb) all have a tringular pryimidal shape. From...

Is it possible to use magnets (donut shape) to float a carbon arrow in the center of the donut (LEVITATION USING CARBON.

8. [CJ6 14.P.001.] A mass of 135 g of an element is known to contain 30.1 1023 atoms. What is the element? carbon hydrogen oxyden aluminum This is the question on my Physics practice test for my exam tomorrow. i don't know where to even begin with this one. we haven't really gone over...

Let me explain my situation. Recently I was admitted to a material science laboratory at my university (University of Puerto Rico). We are going to try to grow carbon nanotubes by the Chemical Vapor Deposition (CVD) process. My first step is to get information on the technique (wich is...

I don't know if this is in the right forum but it seemed to fit quite nicely in here :P I was wondering about cxarbon nanotubes. There said to be really very strong, but what i don't underdtand is why? There so very thin! Doesd nanotechnology behave differasntly to microtechnology due to the...

Are we Carbon based life, proton-proton based life, space-time based life, string based life, or what?

Imagine a tube or sandwiched wall of carbon, with width W. Now fill its interior with connected buckyballs of random diameters d up to d~(Wrbuckminsterfullerene)1/2. This artificial organic structure mimics that of natural wood, bone or pumice. It retains maximum strength and rigidity with...