Sensei

michel123456, you are asking questions like you would never saw Young's experiment in your life... ?! Setup to Young's Experiment I bought for $7 in local physics equipment shop. Laser 100 mW green for $15. It has two frames. One frame with width of slits 0.03 mm Distance between centers of slits 0.06 mm. Second frame with width of slits 0.05 mm Distance between centers of slits 0.1 mm.

I am quite surprised. Learning in private Christian USA school means immediately that it'll propagate creationism.. ? Is it not good reason to get child out from it.. ?

V equal approximately 4.828 is the answer. 2* (sqrt(2)+1) = ~4.828

These tests strongly rely on perfect English language knowledge. IMHO to truly test somebody mental acuity we need tests that will work without having to know language perfectly. That's why IQ tests looks like they look. Try beating chimps in this: They must love these drops..

Quick? Perhaps with very small primes.. For computer it's completely not practical. You don't want to solve unknown power equation on computer ever! Unity+ wanted to check prime that has ~77 millions decimal digits...

What is angle between A and B picture?

Press More Reply Options, then you can attach files..

It's not the right answer. I entered it to OpenOffice A column is velocity B column is K.E. with v C column is. K.E. with v+2 D column is C/2 See where they're crossing.. You should not guess, but calculate.. v^2-4*v-4=0

So equation to solve will be: 1/2*m*(v+2)^2 = 1/2*m*v^2 * 2 m is common, solve v.

What is classical Kinetic Energy equation that you learn in the first class of physics?

Maybe by using yet another magnet to attract/repel it? Alternatively using thin piece of steel/iron, so magnet will attach to it, and you will be able to pull both.

yahya515, without math you have hypothesis, not theory. http://en.wikipedia.org/wiki/Hypothesis

I just wanted to clarify why Uranus has such weird axis and rotation different from other objects in Solar System (not to support or reject yahya515 idea). It's all result of previous interactions of object in the past. If we will have ball spinning clockwise in Y axis, and other ball will hit it on "left side", it'll start spinning even faster clockwise in Y axis. But if hit will be on "right side", spinning might be stopped, or even reversed to counter-clockwise.

It's quite known that Uranus collided with other massive object at the early age of Solar System. Unusual axis is result of this collision. Similar like Earth was hit by object and as a result Moon has been created from ejected mass.

Negative mass, thus negative energy, is (or rather was) just hypothetical concept, not confirmed by evidence. http://en.wikipedia.org/wiki/Negative_mass Black hole radiation is also not experimentally confirmed. Which is stated on bottom of page http://en.wikipedia.org/wiki/Hawking_radiation

Your calculations are complete nonsense. Let's for instance 1.0078 grams of protons and 1.0078 of antiprotons (6.022141*10^23 * 2 = 1.2*10^24 of both particles) E=m*c^2 = 2 * 0.0010078 kg * 299,792,458^2 = 1.8115*10^14 J E.K. of one of them = 1/2*m*v^2= 1/2* 0.0010078*(299,792.458*0.1)^2= 4.53*10^11 J Total E.K is 1/200 of total energy released.

I feel your frustration (especially because you don't seem to be apprentice, but private person). But that's how Homework section works on this website. You don't get instant answers for questions, rather hints that should direct you to the answer (and you have to do rest by yourself). Do you saw Example Proof on that website? http://www.poweroflogic.com/cgi/Proof/checkprf.cgi?usrchc=Example&exercise=8.1C Click "Check Proof Now!" and you will see message "Congratulations: No errors were found in the proof.". This is how proof on that website should looks like.

http://en.wikipedia.org/wiki/Bell%27s_spaceship_paradox Mine link works fine. You can try using shortening links websites. Similar to what Twitter uses. There is plenty of them on the Internet.

12.32 grams of metal is sum of masses of zinc that didn't react plus silver that was made from silver nitrate.

Practice is better than theory I have produced plenty of Al2O3 . 3H2O At the beginning of production they can look like long ultra thin fibers floating in water. You can see couple photos here: It needs to be heated (or leaved until water vaporize) to have pure Al2O3 One is floating on water (for year or so), because bubbles have hydrogen and oxygen gases.

Rasen58, do you feel confused by mine post? I am really sorry for that..

At least author will learn how to calculate number of particles and mass of single particle or molecule. Aluminum has 13 protons in nucleus and 13 electrons. http://en.wikipedia.org/wiki/Aluminium Boron has 5 protons in nucleus and 5 electrons. http://en.wikipedia.org/wiki/Boron It's obvious that when number of protons is equal to number of electrons they cancel their charges and we have neutral element.

1 mol (6.022141*10^23 particles or molecules) of Chlorine has ~35.5 grams (stable isotopes with 35u ~75% and 37u ~25% abundance). So 3.9 g / 35.5 g = 0.11 * 6.022141e+23 = ~6.6*10^22 particles. 6.6*10^22 particles / 3 Chlorine in each molecule of MCl3 = ~2.2*10^22 molecules of MCl3 1 g / 2.2*10^22 = ~4.545*10^-23 g per particle of M Divide it by 1 u = ~1.66*10^-24 g 4.534*10^-23 g / 1.66*10^-24 g = ~27u Aluminum has ~27u mass. Aluminum has charge +13 in nucleus (and 2+8+3 electrons = -13 charge) Boron has +5 in nucleus (and 2+3 electrons = -5 charge) http://en.wikipedia.org/wiki/Boron Either of them has 3 valence electrons.

If you will be doing science for real in future, I suggest to getting Full HD camera with tripod. The more frames per second, the better. It's device that will keep camera in the same position and angle for a long time. Then copy movie from camera to computer, and load it to movie editing software such as VirtualDub (it's free). You can then precisely find time of some physical event counting frames between start and end of event. It's much more precise than using stopper. Times you can enter to OpenOffice SpreadSheet application (it's free). And generate chart. After that you will see what I said in #3 post. That cycles of spinning back and forth clockwise/counter-clockwise are shorter and shorter, the longer experiment is running. According to Internet some of them costs $1-$1.5 for piece. They are also used by fishing people, so you should find them in fishing shop. http://en.wikipedia.org/wiki/Fishing_swivel http://www.fishingwarehouseshop.co.uk/product_info.php/products_id/5661 It's for 2.61 ukp = $4.4 (10 pieces in package) so single one $0.44

Fishing line is usually made of plastic. If you don't know something, enter it in google, and you will have answer. http://en.wikipedia.org/wiki/Fishing_line In USA people (small amount. Personally I don't know anybody fishing) are fishing mostly for fun, not for food (except Alaska). It's such entertainment. Most of them are later releasing fish.