Physics

are they physicaly real? what is thought to prevent them?

I can understand why there is a tidal bulge on the side of the Earth that is facing the Moon because basically the Moon is pulling on the sea that is facing it, however what I cannot understand is why there is a there a similar bulge on the opposite side of the Earth as there is nothing on that side pulling on the sea. Could someone put me out of my misery as this has confused me for years? Thanks

do the electrons in, say, a battery, actually leave the battery, enter the circuit, travel around it, and back into the battery again (and so on, and so on...)

or is voltage inversely proportional to current? (i've been given two conflicting pictures, one from the net; one from the television) the one from the net; voltage is inversely proportional to current. the uk uses 240 v mains, the us uses 110v mains. the us is therefore safer, but requires more current (and therefore larger cables which are more expensive) the one from television (bbc learning zone); voltage is directly proportional to current; the bigger the push, the bigger the flow i'm guessing myself that the area of the cross section of the circuit wire is key to the magnitude of the current, no? (and the voltage is key to the VELOCITY of t…

will acids/ alkalis attack a metal when the metal is molten? e.g will hydrochloric acid attack molten iron?

While thinking about random walk on a graph, standard approach is that every possible edge is equally probable - kind of maximizing local entropy. There is new approach (MERW) - which maximizes global entropy (of paths) - for each two vertexes, each path of given length between them is equally probable. For regular graph they give the same, but generally they are different - in MERW we get some localizations, not met in the standard random walk: http://arxiv.org/abs/0810.4113 This approach can be generalized to random walk with some potential - something like discretized euclidean path integrals. Now taking infinitesimal limit, we get that p(x) = psi^2(x) where…

will centrifuging an alloy in it's molten form seperate the elements within it?

If an astronaut went outside the space shuttle (all protective clothing worn of course) and attached one end of a slinky to the shuttle could the astronaut create a longitudinal(or transverse) wave in the slinky?

is molten iron magnetic? if you put an electro magnet above molten iron above it would it rise up to it?

Hello all, I'm a sophomore in highschool and I am planning an experiment with ferrofluids for a science fair next year. In my experiment, I would like to test whether the heat of a ferrofluid affects the size and number of spikes of ferrofluid that is magnetized. I want to put ferrofluids of different temperatures in different tubes. I would then place a magnet beneath the tubes and measure the number of spikes and record their heights. I have some questions though: 1.) What should the tubes be made out of? I would like a medium that is clear and does not block the magnetic field much. 2.) What kind of magnet should I use? I am thinking neodymium perhaps. …

How do they store information on audio cassettes? How is it read and translated into sound?

i've been trying out the beginners experiment of rubbing a comb through my hair, then using the charged comb to bend a small trickle of water from a tap. a) does the comb strip electrons from my hair? or vice versa? b) why does the water bend?

...THE CHARGE ITSELF? in other words, if i hold up a card marked "charge", i, in a sense, have a "charge" but i can put the card down, and we both can exist independently is the proton/electron like this? can it be separated from its charge, or have its charge taken from it, and still exist? if not, and if the charge is integral to it, what is it other than the charge? and if its nothing without its charge, then does that not imply that it is THE CHARGE ITSELF? (my confusion / curiosity stems from reading often that, "an electron/proton is a particle WITH a charge)

When an object travels at nearly the speed of light, it gains mass. My question is, how does its mass gain look to an observer? Let's say the object is a spacecraft leaving the galaxy, and you're here on Earth. If you had observed the people inside the spacecraft (from its departure until it eventually attained the near-light speed), would you have witnessed each person growing in size? Would the travellers have noticed their own growth while it happened? And if they continued on the way to gaining near-infinite mass, does that mean you'd eventually see their physical bodies and spacecraft expanding into our solar system (from their other end which is still…

Can someone please tell me the values of physical properties of human tissue at 5 MHz: conductivity, relative permittivity and density. It is also helpful if you can put some links or if you can recommend me a book...

Is there a size comparison of a photon, an atom, and a virus in a book or somewhere online?

if we approach an event horizon of a black hole would we be pulled in faster than light? if so then would time for that object reverse as the theory states for an object moving FTL or would it just look that way???

according to E=Mc2, if we traveled close to the speed of light then time around us would slow(by us i mean the one traveling) if this is true, then we could live far past our life expectancy (at least, from anothers point of view we would seem ancient) we could travel away from earth at a constant speed and then return then we would be able to skip decades, centuries and in some cases millenia.

We are looking for Physics Teachers (current teachers or those with recent GCSE teaching experience) to write some audiobooks for the website http://www.gcsepod.co.uk. You’ll be asked to write scripts of around 5 minutes on curriculum topics. The work is paid and can be done from home in your own time. The scripts need to be engaging, lively and informative. We particularly need writers in the area of Physics. If you’re potentially interested please send me an email me back at jane.parks@soundbitelearning.co.uk. Please include your CV and your areas of specialism within Physics, although a lot of this is covered on your site. Look forward to hearing from you.

because of einstein's theory then we humans could not achieve faster than light travel, but what if we didn't use speed? what if we could pause time or body oxidization and allow time to pass wihout our knowledge? Could we also use inter-dimentional/inter-universal travel? in one universe the time could go quicker, slower or stop all together, or the area we travel might be less so if the distance on earth is 1km for instance then in this parallel dimension/universe then it could be 10 cm, m, km, lightyears even!

hello, What is Centrifugal Force ?

is there any life in the universe or mars.

Do u ever thinking how the life on earth exist? do u think it is so coincident it happened from big bang theory or volcanic activity found on earth?asteriod strike and lighting caused life to exist? the accidental combination of all element together to form DNA and human? millions lifes on earth born from single cell molecule? the life on earth is too complicated to happen in chances. even nowadays scientist can't even create a single cell molecule given all the element and resource. Even single cell molecule has a very complicated function itself,needless to say other higher primates.. human anatomy has millions of individual function. there is no coincident. the…

The mass is constant, and there is a varying force. So would the mass be the dependent value(y-axis) and the acceleration be the independent value(x-axis)? I think the mass is the dependent value so when I graphed it the line went straight across(horizontal). Is this right?

Is it possible to put two sources of energy into one object, even if it's just to switch sources of energy to without letting the object turn off? If I put a magnets in an upright position (see picture), will it spin? Would this picture be possible?