Sensei

I have yet another explanation of such quasi-welding. When you heat/cool object, its volume is changing, so do little roughness on it, and microscopic mountains on two surfaces jam together. After cooling down it's extremely hard to disconnect them. I am fighting with this everyday during distillation when two pieces of glass are nearly impossible to disconnect. Couple times thought glass will be lost.

Devices like Penning trap http://en.wikipedia.org/wiki/Penning_trap and magnetic trap http://en.wikipedia.org/wiki/Magnetic_trap_%28atoms%29 could be used to hold it.

In ancient world the most common was foot length. (calculation of Earth radius was done ~200 BC by Eratosthenes)

And then you have: -5 * (-4) = -20 -5 * 4 = (also) -20 5 * (-4) = (also) -20 Only one would lead to positive result: 5 * 4 = 20

If we have: [math]x * y = xy[/math] we can divide both sides by y: [math]x * y/y = \frac{xy}{y}[/math] and get: [math]x=\frac{xy}{y}[/math] f.e. [math]-5*(-4)=+20[/math] [math]-5=\frac{+20}{-4}[/math] [math]-5=-5[/math] (true) If you try the same with your assumption "If we assume that (-1) (-1)=-1 and (-2)(-2)=-4" it will fail. Left side of equation, won't match right side.

Top sportswomen here said she is eating 6000 kcal per day. You would like to have muscles as she.. I was eating something 3000-4000 kcal (without counting 3-4 beers). And making 300 push ups/day (my record is 1000 or 1100 in a day) + a lot of other trainings. With constant BMI ~21 Currently day training is weight lifting 3600 kg in couple various exercises in series during whole day. Eat like Hercules: ...and work like Hercules: https://www.youtube.com/watch?v=v0FWHtuli9A ..as long as you keep thinking about particles & quantum physics while doing all these exercises..

Since you're not willing to do scientific work, I will do it for you. Volume of sea is 1.3 bln km3 according to: http://en.wikipedia.org/wiki/Ocean It's 1.3*10^18 m3 Density of water is 1 g/cm3 so 10^6 g/m3 m=1.3*10^18*10^6=1.3*10^24 grams Molar mass of water is 18 g/mol 1.3*10^24 g / 18 g/mol = 7.222*10^22 mol If Earth exists for 4.5 bln years, *365*24*3600s= 1.42*10^17 s 7.222*10^22 mol / 1.42*10^17 s = 508574 mol/s average rate of production of water per second. To create 1 mol of H2O there is needed 0.5 mol of Oxygen. So there is needed 254287 mol/s of O2 1 L of O2 gas has 0.0446 mol. So 254287 / 0.0446 = 5701505 L/s of Oxygen must be gone from atmosphere. It's 5701.505 m3 of pure Oxygen, per second. * 3600 * 24 = 0.49 km3 of Oxygen gone per day. 2.34 km3 of air losing its Oxygen. Plausible or not?

It's called pair production. And it's known for 80 years. http://en.wikipedia.org/wiki/Pair_production So not sure about what students you're talking about.. It requires a lot of energy. Half million more than has green photon. It's also known for ages. It's called annihilation. http://en.wikipedia.org/wiki/Annihilation

Do you generally know how to check which gas is produced in (any) reaction? - if it's exploding after providing source of fire, it's typically Hydrogen (reacting with Oxygen from air). (could be also methane, ethane, and other flammable gas, but they will create CO2 and H2O, while Hydrogen only H2O) - if fire is more powerful, it's Oxygen. - Chlorine you can smell directly (and not recommended/not possible for longer period of time). - Noble gases can be detected by ionization by high voltage. Their spectral lines, thus color of light in discharge tube is different. For others more sophisticated methods of detection are needed.

Escape velocity from surface of Earth is 11200 m/s, while Hydrogen gas has velocity ~1200 m/s @ 20 C.. Another thing: find flux of protons per second per area unit, multiply by time planet exists and Earth surface area pointing at the Sun. Find volume of sea, calculate quantity of H2O molecules, and compare these values. Tell us what numbers you got and from where for verification.

Website is asking for the LOWEST possible. After entering yours, we can see "The answer is incorrect! That is not the lowest possible value for X". I wrote C/C++ app (in less time than writing this reply), and it's crunching stuff. So far working for 104 minutes, and didn't find answer yet (and there is chance never will).. I attached it, so you can review, compile and run on your machine. ModPuzzle.zip Would be better to convert it to multi-threading. This would accelerate 8 times on Core i7.

Temperature and pressure (from atmosphere) are right. You don't have to search far, and look at other planets. Take for example Moon. It's not so far away from Earth. But if you would leave water tank on dark side of it, it would instantly freeze. If you would leave water tank at day, it would instantly vaporize because photons from the Sun would heat it above boiling point temperature. When the Sun will increase power in future it'll happen to Earth anyway.

Not possible.. ps. Come back when you will have some science experiment to show us. ps2. When you have knowledge, you don't need to belief.

Confusion arise because some people use "mass" while they mean "invariant mass", and other people use "mass" while they mean "relativistic mass" (total energy divided by c2: m=E/c2). When two such incompatible persons meet they need to figure out in what sense they use "mass" in the first place. Suppose so we have hermetic box with mirror walls and inside of it (not visible from outside) light source. It's starting emitting light. IMHO box doesn't get lighter just because photons are emitted. They're all there, just bouncing from mirror walls.. If it would become lighter (less mass) we could detect when light source is turned on or turned off, on weighing scale.

Do you have BaSO4 or is it theoretical question.. ?

Sorry, but I see no invention made by you. How are you going to extract energy? Energy generator needs to: - increase temperature of body. This is what burning carbon, burning oil, burning methane, nuclear power plant, power stations are doing. This body is typically water, which changes to gas state, and moves rotor blades of electric generators. - increase velocity of electrons directly (water dam power station, wind power station). - chemical reaction changing one compound to another compound, which later can be f.e. burned and release energy at will. f.e. electrolysis of water to Hydrogen and Oxygen, then liquefy, and burn in rocket while launching in a few seconds.

Are you aware that you're turning iron to magnet by placing close it to permanent magnet? Take for example steel knife, magnet and needle. Touch needle by knife, they don't attract each other. Attach permanent magnet to one end of knife. Touch needle again by other end of knife. Needle will be attracted by knife. Disconnect magnet from knife end. Needle will disconnect too.

Here is even nicer version It's not just copper, I said metal. And you don't need pipe actually. U shape or L shape metal works as well. I was doing it hundred time with different materials (the most often Aluminium), with different magnets. With stopwatch/digital camera (and compare frames in image editing software) you can measure speed of passing through them.

Your assumptions are wrong. Do you have metal pipe and magnet? Reproduce this experiment:

Sorry, I "forgot" about you.. Fixed now.

Science is not "man made". Man is just learning how Universe is working. I strongly recommend it to you. Science works the same way for Christians and Muslims as well as for the Jews, as well as for the Atheists, as well as for the extraterrestrial life form.

tylers, I recommend you getting ball-and-stick model f.e. http://www.ebay.com/itm/Scientific-Inorganic-Organic-Chemistry-Atom-Molecular-Models-Links-Set-GFY-/381171962175?pt=LH_DefaultDomain_0&hash=item58bf9e913f Mine model. 245 atoms in package.

That's quite normal behavior of WWW software. Forum software doesn't know that somebody closed his/her web browser without pressing Sign Out (who is doing it every time? Nobody). And person is automatically logged off after a while of inactivity by forum software (it's periodically checking last activity of every user, and if current time minus last activity time is higher than some threshold, user is automatically logged out). There should be history of at least 10 last logging in, with start date & time, and length of activity, and IP of each logging.

Each particle has properties: charge and "elementary magnet" ("magneton"). When their properties don't cancel at quantum level, we can observe their effects at macroscopic level. f.e. when charges cancel we have non-polar liquid, when charges don't cancel we have polar liquid (f.e. water). when elementary magnets cancel we have non-magnetized matter, when elementary magnets don't cancel we have various types of magnetized matter. Imagine how electromagnet is made: we have non-magnetized *) iron bar, entwined by wire with length d, through which we pass current I. The more current, the more charge per second: Q=I*t 1 A * 1s = 1 Coulomb. If we divide Q by e constant 1.602*10^-19 C, we receive quantity of electrons flowing per second through wire. Strength of electromagnet is depending on current I and quantity of entwine. The higher I, the more Q, and the more electrons is flowing. And stronger electromagnet. But you can't pass any current you want. When you will pass too high current, wires will be overheated and melt. This is limiting strength of electromagnet. Which should answer question about maximum possible magnetic strength. Similar limit has also permanent magnet: quantity of particles in permanent magnet bar is given by mass/molar mass. f.e. 100 gram Iron / 56 g/mol = 1.78 mol * 6.022141*10^23 = 1.07538*10^24 iron particles. Particles which can align the same way is smaller than that IIRC. Maximum voltage you can have depends on breakdown voltage of used isolators. http://en.wikipedia.org/wiki/Breakdown_voltage Quantity of charged electrons (or holes) is limited by quantity of atoms used to make electrodes on which they will gather. Imagine how permanent magnet is made: we have non-magnetized iron bar (elementary magnets inside are randomly aligned), we're entwining it by wire, and starting heating iron bar (there is needed temperature > 770 C), and at the same time passing current through wire. (so basically making electromagnet) and then continuing to pass current, while cooling iron bar. Elementary magnets in iron bar freeze at state they gained at high temperature under influence of magnetic field created by electrons passing through wire. *) if permanent magnet is used instead, we can destroy uniform alignment. Destroy permanent magnet. Dropping of permanent magnet from too high altitude can also destroy magnetization. Hitting it by hammer can also destroy magnetization.

That had to be before 1962.. http://en.wikipedia.org/wiki/Noble_gas_compound