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Here is an interesting periodic table: http://xray.bmc.uu.se/Courses/Tables/periodic_table.html It shows that the names Group III, IV and V are OLD names and that thre is a new IUPAC standard of naming the groups and Groups 3,4 and 5 are not the same. This is an article from Wikipedia about...

OK, so the volume of this trough: If h is the height of the water and x is the length of the sides of the right isosceles triangle, the length of the top side of the trough is 2h. Pythagorus says: x2 + x2 = (2h)2 2x2 = 4h2 x2 = 2h2 So, V = area of cross-section . length of trough V =...

I would start with Wikipedia - http://en.wikipedia.org/wiki/Interferometry At the bottom of this is a list of other links and sites with information. Hope that helps. Wiki knows EVERYTHING! (As does Google.)

Actually, de Broglie proposed that electrons were both particles and waves. He thought that if light were a wave that exhibited particle properties, perhaps these two were linked and for neatness he proposed that particles also exhibited wave properties. Thus, an electron, being a particle...

If you graph it, there is a third solution with -1 < x < -0.75 Newton's method seems the best way to get there. Then show 2^n>n^2 for all n>4 and 2^n<n^2 for all n<-1.

*palm forehead* Indeed, gravity is not a force - it is weight. I do apologise. F=mg. It is the force due to gravity - weight force.

Just doing a quick google with "geometry practice questions" I found this. They are US SAT questions, but it may help. http://www.onlinemathlearning.com/sat-practice-questions-geometry-1.html I'm sure there is more out there.

No problems, sometimes it just needs a nudge in the right direction.

Echelon4 - don't stress. I am a true believer in Wikipedia. If the answer is not there, there is sometimes many links to other places where you can find more information. The page for Particle Accelerators is: http://en.wikipedia.org/wiki/Particle_accelerator Essentailly, by smashing the...

They are still neutral after being doped because they are being doped with atoms that, while they have 5 electrons in the outer valence shell, they also have an extra proton in the nucleus to counterbalance the extra doped electron. Likewise, when you dope with an atom with only 3 electrons in...

Well indeed. THere are 4 forces on a rocket (there is a paper on this on the NASA website - google Rockets forces) - THRUST, GRAVITY, LIFT and DRAG. THRUST is due to the engines GRAVITY - would decrease as the rocket lifts due to less mass and greater distance from the Earth. DRAG - would...

Additional to that, as you get further away from earth, the pull of gravity (acceleration due to gravity) reduces. Since: g = Gm/r2 So as r (the distance between the space ship and earth) increases, g decreases. Now the reason rockets have more than one stage - I think that also has...

Can't be. The answer has to be negative. The inner diameter would be decreasing. Surely?? EDIT: Mountain.Dew, problem with what you have done is the rate of change of diameter is given, not radius. So, using diameter, I still don't get 7/2 but -1/2. If one thinks creatively about 7/2 it is...

I googled "solid state devices" and "environment" and found some nice articles about solid-state device and solid state lighting and it's implications on society and the envirornment. http://www.aip.org/pt/vol-54/iss-12/p42.html http://news.rpi.edu/update.do?artcenterkey=740&setappvar=page(1)...

Indeed. You need to work a nice answer that uses keywords but then explains them. So to say that you can use the Slingshot effect, is not enough. You then need to explain that.

Well, ∫e^atdt = (1/a)e^at + C And if you have, (since ^b is just a constant) ∫e^at+bdt = e^b∫e^atdt = (e^b/a)e^at + C OR = 1/a(e^at+b) + C...

Hmmm, tricky one. But Newton's Third Law states that for any action there is an equal and opposite reaction. I am assuming this space probe is in the weightless vacuum of space (if not, correct me). A jet of air to one side or behind will certain increase speed or direction and it wouldn't use...

Hey there Roobs. I too have Jacaranda and it explains Induction heating well. However, there is an additional effect going on in magnetic materials that is not happening in non-magnetic materials such as Copper. http://www.ameritherm.com/aboutinduction.html There is an effect called Hysteresis...

Hey Adhara, As a girl who did Engineering at Uni some years back, good on you! There should be more of us in this world. Girls rock at Engineering.

Hallo, Es gibt SBS Radio im Internet. http://www9.sbs.com.au/radio/language.php?language=German Man kann dort Hören üben. Vielleicht werden sie sehr schnell sprechen ABER, wenn man sich ein bekanntes Situation anhört, dann ist es leichter zu verstehen. Viel Glück.