Physics

Just wondering,is the 3rd dimension just depth?

Hello, I have four questions. As it stands now, I don't have the necessary materials to test this myself, which is how I'd prefer to learn the answer. I still plan on doing this experiment for fun once I can acquire the necessary components. This deals with Lenz's Law. My goal is to maximize the time it takes for an object to fall through a tube. 1) Most folks demonstrate Lenz's Law by dropping a magnet down a copper pipe. From my understanding, the relative motion of the magnet, to the copper pipe, is responsible for creating Eddy currents, which, in turn, provide an opposing force on the magnet as it falls. My first question is this: Does spinning the copper tube crea…

While special relativity says inertial mass is equivalent with energy, there are at least two more types of mass, for which equivalence seems not so certain - let me briefly summarize and ask for more arguments for/against their equivalence. Gravitational mass is hypothesized to be equal by equivalence principle, and gravitational interaction of antimatter now seems nearly certain to be the same (?) However, all these tests are for baryons and bulk matter made of them, for non-baryons I am aware only of this 1967 Witteborn, Fairbank test for electron - measuring maximal time for thermal electrons reaching upper electrode tmax=sqrt(2h/g), which turned out infinite, sugges…

Hi: Is it possible to design and build a laser that emits 400 nm light at the extremely low intensity of 1-photon-per-second. This is one extremely low power laser! Thanks, Green Xenon

Hello, I recently got informed of how 3D 'angles' work, e.g. in a sphere type 3D 'radius'. However, I was thinking of how one would even think of a 3D angle? Or is there already a measurement for one? If one took a sphere and made it 4D would a 4D angle look as if a sphere in a sphere or a torus? (ironic because this is how the universe is hypothesized to look like ) Aplogies if the last sentence is irreadable (unreadable?), I don't know how to describe something if I don't know what it is

The 9/11 Massacre is quite known to everyone. I was wondering the mechanism behind the massive destruction. Is it the principle of Center of Mass?

Having just recently signed up as a member of SFN, a friend has asked that I post the following document relating to molten metal at WTC 1, 2 & 7. The PDF link... http://www.journalof911studies.com/volume/200704/ProfMorroneOnMeltingWTCsteel.pdf Can I ask people to give there thoughts on the accuracy of this document written by Professor Terry Morrone. This seems like the best place for people to look at this through the impartial objective lens of science.

Two similiar barrels A and B with the same radius and mass roll down the same slope starting at the same instant.Barrel A is filled with liqued water, and barrel B is filled with ice of equal mass(Barrel B slightly longer than barrel A to compensate for the slightly larger density of liquid water) which barrel reaches the bottom of the slope first? and why?

A Basketball ball is dropped onto the floor.What force causes the ball to bounce?

Using a dual plasma rocket where one uses mater and the other uses anti-matter which combine in a mixing chamber just before the nozzle would produce the higher thrust like a chemical rocket with the economy of a plasma rocket - or would it? I know it is not currently feasible due to cost and storage problems with anti-matter but as a concept is it doable?

Praise without end for the go-ahead zeal Of whoever it was who invented the wheel! But never a word for the poor soul's sake Who thought ahead, and invented the brake. I've seen a lot of ink spilled (electrons manipulated?) about massless propulsion, and I realize that it could potentially be used to accelerate a ship "in reverse" to act as a brake, but how would its energy consumption stack up against the following idea, assuming the idea could even work? Given: Some form of drive has been developed that can get a ship up to a significant fraction of c Given: A power source sufficient for the job and materials that could withstand the rigors of use Given: Relativity te…

I formulated an equation which describes the radiation emitted by an accelerated charge in a gravitational field as [math]P = \frac{2}{3} \frac{e^2}{(\frac{m^2}{1 - \beta^2})c^3} \frac{1}{\frac{\sqrt{1 - 2\frac{Gm}{\Delta E} \frac{M}{r} + \frac{GQ^2}{c^4 R^2}}}{\sqrt{1 - 2\frac{Gm}{\Delta E} \frac{M}{r} + \frac{GQ^2}{c^4 R^2}}}} (\frac{dP}{dt})^2[/math] [math] = \frac{2}{3} \frac{e^2}{c^3} \frac{a_{g}^{2}}{(\frac{\lambda}{\lambda_0})} [/math] The unique part of this equation is that not only does it describe the energy emitted, but it describes the wavelength emitted [math]\lambda_0[/math] and an observer at [math]R[/math] measures the wavelength as [math]\lambda_…

Hi, I have this understanding of the nature of SpaceTime, and I'm just wondering if this is already common knowledge. My understanding is this: Space and time are dualities of each other, so they will be opposite in every way. In their relationship, space is the multiplicity, that which is observable, and time is the singularity, the absence of observation. Now, The evenly balanced view of this duality would be that only one truly "exists". But since were are of an odd(3) number dimension, the observation of existence is an odd, uneven, asymmetrical balance; therefore that which wouldn't exist, does, just indirectly. We are of the multiplicity, th…

Perhaps some smarter folks could assist me in thinking through this, but I think something important from physics is missing. There are several theories out there that support the universe being made up of different possible units, one such example being information theory, where information is the basic unit of the universe. What makes these theories so interesting is their outside of the box nature, and a different approach to much of the same data that makes up more classical theories. That is not to say any such theories are proven, nor provable, but I think its a good thing physics is moving into new arenas. Perhaps it's not quite as scientific as we would desire …

Forewarning, some of what I am going to say is speculative, but I am not postulating any of it's true, it's for the purposes of my questions. Regardless, if I rant too much feel free to move this thread. 1. Does anyone else have a problem with sharing "space" mentally between the concepts of locality and infinity? To me, the two ideas seem almost mutually exclusive. In an infinite universe the theory of locality implies that there are flat out information disconnects throughout the universe, because you can have empty regions of space so large, the expansion rate is faster than light and no information enters the region or leaves. Places where no information is or eve…

1. in AC corona discharge tubes (such as in ozone generator tubes), are all the molecules positively ionized? (out of the ones that are ionised of course, i know some aren't) or some negative and some positive? 2. if nitrogen is used in such a tube, will the ions only be N2+/-1 or will some be +/-2 etc? will any of them completely split into atomic nitrogen? 3. if nitrogen is used in such a tube, will the nitrogen ions stay in an ionised state and come out the other end still ionised or will they somehow combine (like oxygen forming ozone) or 'deionise' (for want of a better word) one another? i think that is all. please refer to which questions you are ans…

Hi all ! and thanks for the replies to the related preamble post "Metal under the hot sun" found here: http://www.scienceforums.net/forum/showthread.php?t=35416 Let's imagine... Metal pipe(s), say 10cm ⌀, vertical, blackened, say 3metres long, vents at the bottom, exposed to sun heat. A nozzle misting seawater inside from their tops. Flow calibrated to always have a little brine draining at the bottom. A shaded wind cooled condenser at the top of the pipe(s) to collect evaporated water. There is room for some improvements as transferring the condensed water warmth to the incoming cool seawater with a exchanger, etc. but let's ignore those. There is …

A DC motor has two windings, one for the rotor via brushes; and one for the stator to create the 'bias' magnetic field. Fed with separate supplies, the stator magnetic field consumes 1 Ampere at 10 Volts; and the rotor consumes 2 Amperes at 10 Volts. That is 10 + 20 = 30 Watt, and the water pump it drives rises a column of water 25 metres high. That same motor gets a transplant of its stator electromagnets, replaced with permanent magnets that produce the same exact magnetic field. Now the motor driven water pump pushes water to the same exact height of 25 metres high as before in the same time, consuming 20 Watts by the rotor. What is going on? -The …

http://www.geekarmy.com/Science/Cool-Battery-Demonstration.html can anyone explain this? is it even Real? I wonder because only the B stream seems affected, so if both are Equal then what makes B so different?

Hi everyone, I hope my simplicity isn't frustrating for you all. I just have a few questions: 1. When a power source gives energy to the free electrons in the current, do these electrons turn from a negative charge to a positive charge? 2. Where do the free electrons come from? Am I correct in assuming that they are in the wires and the volts from the power source energise them to flow? Ar have I got it completely wrong and they actually come from the power source, along with the volts? thanks in advanceeveryone!

I'm new at these forums so feel free to correct me. I need to calculate the number of oxygen atoms in a volume of water and oxygen gas near sea level. (at the same temperatures say 70 F). Thanks for the help!

Ok, so first off, angular momentum doesn't need to involve rotational motion, and a particle can have "angular momentum" with respect to an axis if it is moving in a straight line that doesn't pass through the axis, right? Also, if the particle had a constant speed and constant mass, then moving along the axis, its angle with respect to the axis would be perpendicular when the distance TO the radius is the lowest... does this imply that the angular momentum of such a particle would be constant? Also, as for the angular momentum of something thrown into the air... let's say we had a water bottle that was filled part way. It was thrown into the air such that its plane o…

In general relativity space bends in a 4 dimensional space right ? Does it bend in a certain direction ? Or can bend in any direction ? Does the direction it bends change whether it causes attraction or repelling ?

Abstract Mass in our most up-to-date theory was beleived to be a by-product of a Boson and its respective field. Finding this particle, called the Higgs Boson has proven difficult. It seems likely that scientists will have to find a new mechanism for mass - and in this work, we will advocate one of those theories. What is Mass? So, what do physicists mean when they speak of a mass, or rather, a mass term? For a while, physicists tried to answer this question a number of ways. There was such a thing as an electromagnetic mass [1] at one point in physics. The was the idea that the electromagnetic field interacted with a quantum object in such a way that it…