Physics

if light is passed through a prism on earth it reveals all the wavelengths/frequency of light that we see as colors. but what would an anti matter prism produce would the colors be inverted or what. just a question thats been bothering me anyone have answers

Could the Earth be flat, but bent by time? In a quad-helix time-like cube spinning 1/4, creating a full circle? Just a thought.

Hello, I'm currently conducting investigation on how the surface area (or width) of a blade on a 3-bladed fan effect the power of the wind produced. I have done lots of research and it seems that there has been lots of experiments and calculations done on the effects of the number of blades and the effects of radius/diameter on power. However, there is little information on the effects of the surface area. I was wondering whether someone can help me explain the relationship between the surface area of the blades and the power, whilst keeping the radius and number of blades fixed? I have collected some data through an experiment where I had fans of the same …

Would someone lose weight just by thinking? Synaptic connection need some energy right? And more energy to consume means more calories to burn. So how many hours a day should i spend on thinking to lose a pound in one week?

Hello everyone, Ok so I read that the reason they are in free fall is because they are going in a circle like this , and the earth curves away from them at the same time or something, could anyone explain it to me simply. Also why don't astraunauts get pushed to the periphery of the space ship by the centrifugal force?They are not wearing belts right, do they I don't know? Thanks

i was lying down and start to thinking randomly. I was thinking about the scale of thermometer. It's just weird to have something below 0 degree. I think 0 degree means that there's no more heat to release. So how come some object can become colder when there's no more heat to release? Is there any limit where something can no more become colder? If there's any then we should make a new scale of degree. I'm curious about how it's gonna be if we just keep absorbing heat from one object . Will we found a new state of matter? I've read about plasma though. I'm new in science world and my major doesn't even close to science. So forgive me if the question is not…

So supposedly angular momentum of a system is conserved, right? Well, consider this video: If, hypothetically, the cat jumped while the roomba was rotating, would the cat be spinning at an angular velocity equal to whatever the angular velocity of the rotating roomba was when the cat jumped?

In free electron laser(FEL) is used magnetic field to make electron move on sinus-like curve - thanks of synchrotron radiation and bosonic nature of photons is created coherent 'light' beam. http://en.wikipedia.org/wiki/Free_electron_laser All fundamental equations of physics we use, conserve CPT symmetry, so imagine above picture from the point of view of such symmetry - we get position moving on this sinus-like curve in reverse direction, producing light beam ... photons traveling back in time! To understand it, imagine 'standard' free positon laser - it produces photons which goes forward in time and space and finally hit into something, for example excitating it…

Let's say two objects of unequal masses were accelerated to the same velocity on separate flat, horizontal surfaces with the same coefficient of kinetic friction. Assume neither object was lifted off the ground and that neither went through a surface or over its edge. Which object would be the first to come to a stop? My tentative guess for this is that they'd come to a stop at the same time. Here's why I guess that. The forces on each object include forces of gravity, friction, and the normal force; force of gravity would be directly proportional to mass, normal force would be identical to force of gravity (given the lack of vertical motion) and friction would be…

“Action at a distance” whenever this comes to play, in physics we tend to think of this in terms of fields whether it may be due to Electric, Magnetic and Gravitational (Well I know these only). Oh yes there’s one more and its Einstein’s Fields equation well I don’t know much about it. So whats the real concepts behind field. Because from my intuition In order to make any change, movement or disturb something you need to touch it, for example if I want to move some object then I need to touch it and give it some force and that seems to be really in sense. But on the other hand there are few physical phenomenon like Electric, Magnetic and Gravitational forces in which th…

I notice that if I hold something in front of but somewhere between my eyes, even something in the middle will be further displaced from the center of my field of vision (assuming that's what it's caused) from closing one eye than from closing the other. Why is that?

Hi everyone, I have an optics question that I hope someone could help a poor chemist out with. I have a Xenon lamp that directs most of the white light in a liquid light guide that then comes out and is collimated at 1" with a lens of the same size. If I wanted to collimate the beam at say 1/4", what is the best way of selecting the appropriate lens to use? There seem to be a bunch of lens equations and I'm not sure which to use for a collimating application. For what its worth my point source is like 0.125" and I think my beam divergence is something like 25.5 degrees. (0.125" goes to 4" beam when viewed 4" away.) Thanks so much for your help!

If we're to simplify damped and resonant oscillations by assuming that there is some specific pattern with which the oscillation's amplitude either decreases (damped) or increases (resonant) then is it still sinusoidal or does it qualify as something else?

Light exist without any matter, charge or anything else for that matter.It consists of 2 fields ( a magnetic and an electric) which oscillate.Both of them sustain each other. The thing which amazes me is that the the existence of the fields is independent of any causing 'thing' along with it.The wave representation of light can clearly be explained as a solution of maxwell's equations in a vacuum .I was wondering are e.m. waves the only solution to these equations.If not what are the others and how would one go about creating other such stable configurations of fields. (please note I intended for this thread to be a general discussion and do not mind even if it drifts s…

So I had a hypothetical idea a while back involving a large rotating wire-mesh (of course, in hindsight, it would be more likely to attract lightning if there were pointy ends distrubuted throughout said wire mesh) turning high in the sky, to attract lightning during thunderstorms, and run it through whatever it leads to. (ie. epsom-salt water for electrolysis, lightning electromagnet, etc...) One idea I had for what it would lead through is a flat sheet of tungsten, immersed in water. As the lightning runs through it, the tungsten heats up; 60 watts of electrical power is enough to light a tungsten bulb significantly; imagine if I were to run hundreds of thousands of…

Is there any difference in the term 'White' and 'Colourless' in Optics? Is a light ray colourless or white. In many books colourless and white means one and the same. But white is the colour of milk while water is colourless.

Let's assume I hypothetically managed to get my hands on a large quantity of magnesium ribbon, and I decided I'd use it to start a bright fire. I'd use something underneath it to ensure the fire was strong, (such as gasoline) but the key component of the show would be the magnesium itself. First off, I assume it'd be dangerous to have the flame viewable directly, so the flame itself would only be recorded by camera. But let's say I had everyone involved facing away from the flame, and instead looking at the buildings, the ground in front of them, and maybe the clouds depending on the conditions. Which brings me to my next question... how would the weather conditions (…

I mentioned before about centripetal forces, and the idea that if some closed container were spun about a central point such that one end of the container always pointed to said central point, the pressure would be higher at the end further from the centre than away from it. Now that I've gotten to the part relating to rotational motion I was also supposed to have learned in introductory physics, one equation caught my attention; a = r*(w^2). This means that the centripetal acceleration (which for constant mass is proportional to force) is proportional to radius; a bit strange, when you consider a = (v^2)/r, where r is in the denominator; but then you consider that v=…

Hi everybody, I have a question about the whole idea that space/spacetime is fundamentally discrete. It's been in the back of my mind since I first encountered it, because I still don't have any clear understanding of what it means. Keep in mind that I have absolutely no understanding of physics beyond some popular science books. So my question is, what does it mean, if anything, for space to be fundamentally discrete? Does it mean that space is broken up into tiny parts? Physically what can it mean to have arrived at a smallest part? Or is it something more subtle than that? Thanks for any input! Peace, Mike

Standard random walk on a graph – that for every point each outgoing edge is equally probable, doesn’t really maximize entropy as mathematics expects from thermodynamical models, but do it only locally. Such models lead to Brownian motion in continuous limit, which is good enough approximation to model diffusion in fluids, but isn’t longer appropriate within fixed structure of solids, like for recently measured electron stationary probability density on a defected lattice of potential wells of semiconductor surface: http://physicsworld.com/cws/article/news/41659 We would rather say that this probability density is quantum mechanical ground state ... but this sample is…

Named for the arrows from the video game Ocarina of Time, I've imagined a potential means of using arrows to ignite targets from a distance in real life... I'm guessing that someone's thought of this before though. Basically, the idea would involve a burning torch, a gasoline-soaked arrow, and a target, within the same path of estimated trajectory (which should in theory be a parabola, and I'm guessing can even be approximated as a line for fast enough arrows travelling along short and/or horizontal enough paths) such that the arrow, soaked in gasoline, would be shot, from a safe distance, through the torch, setting fire such that it does not leave a sufficient vapor …

Is bag strap a moment of force? Ex. the lower the bag is, the heavier? how do you explain it? Do you have a video for clearer explanation, and I can download? Or do you know any examples of moment of force? with videos thank you very much.

Hearing about the recent heat wave in southern Ontario... one of the more obvious thoughts to come to mind is, "well, they should have stored a lot of spare energy over time so that people could use their air conditioners without causing a power outage." But then I began to think... what if, hypothetically, energy were so abundant that people could afford to air condition the outdoor air, at least within the city limits of major cities like Toronto, so that people could comfortably go outdoors? Would it be a good idea then? The method I imaged was of super-powered air conditioners distributed every few hundred metres or so, in areas that would be fenced off so tha…

What is circuits used for at home, anything to describe when you present them and do it as a news report? Thank you very much (:<br><br>Edits:<br><br> What is circuits used for at home, anything to describe when you present them and do it as a news report? Thank you very much (:<br><br> Edit:<br> There is two type of circuits- parallel and series. Parallel is used in households instead of series. If you install a new appliance in a series circuit and some how it breaks, the whole circuit goes off. Using a parallel circuit, the total current is equal to the combined current of each branch. <br> Advantages: In a pa…

This is neither homework nor a question from an exam. I am an aging engineer and I am reviewing all of the calculus that I have forgotton. On p.410 of 'Calculus with analytic geometry,' 5th ed. by Howard Anton, Chap. 7 technology exercises, problem #15, paraphrased slightly to be (hopefully) a little more clear: Suppose that an initially horizontal hollow tube rotates in a vertical plane with a constant angular velocity of omega radians/sec about a horizontal axis, perpendicular to the length of the tube, through one end of the tube. The direction of omega is such that the tube initially rotates down from its horizontal starting point. Assume that an object within…