Physics

How does Faraday Cage effect to communication? If the cage can take up an external charge on its own, will it hinder in transmitting signals from inside? Can it hinder a 1-20GHz communication band if designed to resist few hundred GHz communication? Thanks in Advance! Chinmay

I was just pondering about pressure and it's effects on the body when a thought struck me: Would it be possible to very gradually increase the atmospheric pressure on a human so that they could survive in an extreme pressure environment. I imagined a situation like this: A deep sea laboratory where the pressure started at normal atmospheric levels and increased over time (weeks, months, years?) until the air pressure inside was equivalent to the water pressure outside and the subject would be able to swim in the water without a bulky dive suit. Would this be possible or does the human body have a limit to the pressure it can withstand no matter the rate of pres…

I am doing an engineering course at college and got some information on what I wanted to learn, I saw a question regarding D'Alembert's priciple and didnt know what it was about, for example it was a question that looked like this: mass x accelerates uniformly from rest to celocity of x in x seconds while ascending a 1 in x gradient, resistence is xKN making use of D'Alberts principle determine the tracktive force between wheels/road, the work done ascending the slops, the average power developed by the enginer. I am interested in how the principle works and how it would answer this sort of question, does anybody know of any good websites I could use to learn this pri…

I've been thinking, we have so many means of power, but all of which begin with the use of a potential/normal energy. However I believe that a chain of energy can be started with a force, a force such as a vacuum. (I don't think as gravity as a force that could start an energy chain because gravitational potential energy is basically gravity.) Nothing is all around our little blue planet right? So doesn't that mean we should utilize it? We could create something that would transform kinetic energy into a usable electrical potential energy. I was thinking a wheel or something that had a constant flow of air fed to it through a tube, and after which is rushed out of the tub…

if a moving object, such as a planet, has more gravity than an object not moving? Or, since isnt everything supposed to be moving??, does an object like a planet with more velocity?? have more gravitational attraction than an object the same size with less velocity? I'm trying to develop an explanation on what is causing gravity and the answer to this question may help me depending on what it is. Thank you. You guys are great!

Hi 1st Post I am trying something with an small electro-magnet. I was hoping it would attract steel but it doesnt, if it comes in contact with the steel it will hold it so hard I could swing from it ,but it doesnt attract? Do attracting electro-magnets exist on a small scale, is there anything I can do to make the one I have attract strongly from around 2 inches away? Is there another magnet available, I just need it to attract, and release when current is cut. Thanks in advance for any help!

Just out of curiosity, how do you go about calculating how much electric power is consumed by an electromagnet made of superconducting material? Since the resistance is zero, it would suggest that the current can be (nearly?) infinite. Wikipedia tells me that the only power consumed in a DC electromagnet is due to the ohmic resistance. Another wikipedia site tells me that superconducting magnets can maintain a current with no voltage applied whatsoever, a property which is used in MRI machines. But what if a magnet does work? What if a charged particle comes near, and the magnetic force acts on it? Shouldn't that alter the current in the superconducting magnet…

I wasn't sure where to ask such a simple question - so please accept my apology first for my complete lack of knowledge. So... This one simple thought threw me off completely. And I knew it sounded stupid, but I just couldn't get over it! My physic's teacher is out of reach, so I had to turn to the internet for some solid answers. If high level cosmic background waves from the big bang stretched over time to form longer waves (which can be recorded and thus, we can calculate the age of the universe (?)), why hasn't the visible light waves from the very distance galaxies stretched? What is the difference between the visible light of the EM spectrum and the …

can we get a commercial compound microscope that does not invert the image upside down??

So in my work I've had the pleasure of utilizing the Kramers-Kronig relations numerically to help solve certain problems. I understand the basics of how they are applied and their relationship to response functions. I'm looking for a deeper understanding in the general sense, both in the mathematics and some of the fundamental physics behind their application. If anyone is aware of any resources (review articles, textbooks, pdf's etc.) that could aid me in my plight I would be very grateful. Feel free to give materials that review this from either a mathematics, physics, or applied spectroscopy vantage point. I don't really care. I'm just very interested and want…

What is the charge ? What is its property? Is mass and charge relative? (Means mass must has charge and charge must has some mass)

Its actually a crossword puzzle related to physics. http://pastehtml.com/view/bo1b8dmit.html Here's what I have done. Not sure if all the words that I entered are correct or not. here's the partially completed, changed a few words which were possibly wrong. But still the word Diversion doesn't fit.

... we must first understand exactly what hyperspace is, where it resides relative to matter space and how it functions within the universe. I'm of the opinion that we will only be locked within the confines of chronology protection if we lock ourselves to only understanding material space. Hyperspace generally refers to Kaluza-Klein's 80 year old concept that there is a dimension of existence that takes up the values between "photonic speed matter" thus it involves faster moving particles. What if it is also complimented by a "hypospace" where all moves slower; the tachyon only combining to form the present through sympathetically interfacing with the tardyon?

If the fourth dimension is spacetime, is any 3D object that moves through time, now a 4D object?

Have you seen the movie 'top gun', in it there is a incredible fighter aircraft F-14 tom cat. Its flight is like a boeing airbus thrust?

300,000Km/s ? Why isn't it some other number?

I was reading about "Quantum Entanglement" .. and one explanation was saying that if we have two dices that are quantum entangled, if we roll one for N times and it result in N ordered outcomes, if we roll the other N times, we will get the exact same outcomes ... Not only I'm shocked by that example, but also confused .. my question is simple: what is quantum entanglement exactly ?

yeah, im fascinated by the possibilities of there being black holes and worm holes up there somewhere and im intrueged by what would happen if something went into one :L i attended a 'science live' day in birmingham and we spoke about it quite a bit there. but could anyone go into more detail and explain to me more about black holes and worm holes?

I have had difficulty finding webpages that accurately describe the tide-raising force, and that show how to calculate it. So I have now produced my own. http://squishtheory.wordpress.com/the-tides/?preview=true&preview_id=210&preview_nonce=69cba02793 I show how to calculate the tide-raising force, both by differential gravity, and also by the difference between centrifugal forces and gravitational potentials. Once I had figured out exactly what needed to be calculated, the maths was quite straightforward. It would be helpful if anybody who has struggled with the concept of the tides, would like to tell me if my explanations are sufficiently clear; and al…

My book says r^3/t^2 was found constant by Kepler. What this constant is called? How is acceleration equal to v^2/r in case of circular motion? Why is rate of change of momentum or say product of mass and acceleration equal to force? Why not was it ma^2? How was it proved that it is equal to ma? How newton showed that a spherical body of uniform density behaves as if whole of its mass is concentrated at its center? Also, why is it that a symmetrical body of perfect density balances about the point of center of gravity? What are the latest and advanced means to calculate the value of acceleration due to gravity? How do we estimate mass of a double star? These questions…

Hello! I have a problem, but since this isn't for school I figured I wouldn't put it in the homework section. Okay, so here it is: I need to calculate the resultant temperature of two bodies of water mixed together. The issue is that this is not a classic mixing two liquids in a beaker scenario. The complication is that the two bodies of water are the bottom of a reservoir and an input pipe. Because this is an open system, any water added by the input pipe will mix with the bottom of the lake (and yes, only the bottom because we need to maintain the natural stratification of the lake) without changing the volume of the lake because any water added to the syste…

[THE ULTIMATE UFO SCHEMATIC] VERSION #1 OF (X) COMPONENTS: - VERTICAL BUOYANCY SYSTEM - HORIZONTAL PROPULSION SYSTEM - SYSTEMS TO NEGATE G-FORCES - SYSTEMS TO NEGATE AERODYNAMIC DRAG 1.VERTICAL BUOYANCY SYSTEM PURPOSE: To ascend vertically. To ascend vertically you can use conventional propulsion techniques , such as using explosive materials , or physical applying a force to the air directly around you creating lift. In this case we'll be using a more unconventional technique , which utilizes earths magnetic field , as the medium for creating vertical lift. Earths magnetic field is , as its name states , just a magnetic field .…

If matter controls time (the denser the matter the slower time passes) does that mean if we could create an area in space that had no matter effects such as gravity at all that time would rush forward?

I need better Understanding of Diffraction. Also I would to understand this diagram

I would like to know answers from science, to these following questions. Please answer What is the time? Which observe the time passing? Who experience the time passing?