Physics

Hi, Can any1 help me out here. I want easy explaination of torque. Any help will be most appreciated. Thnx

Just a thought i've had, what if you had enough antimatter mass for it to collapse in itself like a black hole? I mean, i know you'd get a black hole made of antimatter, but what if you threw matter at it then? Would it anihilate, breaking down the event horizon, or would the matter get completly ripped apart and not do anything?

Please excuse me if this is in the wrong forum area. I attempted to fit it in the best I could. I am a high school student that is interested in a career in research in some area of science. I am not certain which field I would like to go into. I am not sure how to begin exploring these interests. The kind of material I am learning now is a bit frustrating. I feel like the way we learn science in school is a bit superficial. For example, we learn that electrons like to be in groups of eight to be “stable,” causing certain atoms to bond to one another. There are subatomic particles, like protons that have a positive charge, and negatively charged electrons that fly…

Hi all. A given osmotic membrane operates at say-500 psi differential to let the solvent-only pass to the atmospheric side discharge. If the atmospheric discharge side is made to operate in partial vacuum and the solution inlet at atmospheric pressure instead; how to calculate an equivalent condition to equally operate the osmotic membrane? How many mm HG would be an equivalent differential ? Miguel

What is String theory? plz. reply:rolleyes:

Is it possible to destroy somthing from the face of exsistance, and if so could it be produced into energy?

Hi, can someone please explain to me how you work out tension. Here is an example of the problems I have. A lift of mass 480kg is designed to carry a maximum load of 3000N. Calculate the tension in the lift cable at maximum load when: a)The lift moves down at a steady speed. b)The lift moves downward, accelerating at 1.5ms-2 c)The lift moves upward, accelerating at 1.5ms-2 Thank you so much!

Things like light, sound, and electromagnetic radiation are considered pure energy, meaning they have no mass. Well, the unit of energy, the Joule, is expressed in base units as kg*m^2/s^2. Well, kilograms is a unit of mass, right? So by that logic, since there is mass in the unit, shouldn't there be mass in the energy? According to the laws of mathematics, you can't have a unit of something without it being present. If energy has zero mass, then any number times zero is zero, so an object with no mass, such as light, should thus have no energy, yet it does. I've never been right on this site before, so the chances that I'm right this time are slim, so where am I…

ok, i need to build some type of mechanism to launch and egg into a pool of water ( approximately 1meter in diameter ) for my physics class. we need to be able to launch the egg at least 15 meters. the pool will be set anywhere from 5 to 30 meters away ( this assignment seems to be more about being able to adjust the launcher ). egg must survive. the egg may be set in a container of some sort but the whole thing we are launching must not weight more then 400grams. problem comes in because my teacher is a nerd, he wants us to have some sort of a launching sequence. he says we need to be able to press one button to get the launcher ready to launch ( start a coun…

My high school physics teacher says that, when Newton invented the laws of universal gravitation, he devised a constant to be implemented when considering the gravitational relationship between two spacial bodies. According to my teacher, it was using this constant that was used to "find" the supermassive black hole in the center of the galaxy (by studying the behavior of the stars around it). He says that this constant's unit is kg^2/m^2 (kilgrams squared per meters squared); however, that's as far as his knowledge goes. He remembers virtually nothing about this constant, not even the numerical value of it, so I'm turning to you guys. 1. What is the numerical val…

my friend and I think of a way of teleporting objects in space. This is only possible if strings exist. our idea takes us to build a machine that could determine specific string/blue print of a specific object. then breakdown matter into elementary particles. load them to a laser project them into space with the information of the string. then rebuilds the matter in the place desired. the string answers the problem of putting back matter to its original form. but how much energy is needed? is it even possible? :embarass:

hi guys hope i`m posting this in the right place. I`ve been reading stuff on the fusor by Farnsworth/Hirsch and I`m not convinced that it is capable of fusion as some of the texts suggest. I`m just wondering if anyone has produced a fusor that actually produced helium as a by product. The second part of my question is could it be converted to produce power and if so how much and is that more then the amount put in? now this is a question from an amatuer so could we keep the wording simple as if it gets too full ofjargon i`mgonna loose you. cheers guys

Yes, yes, we know, to accelerate to light speed you need infinite energy. We figured that much. But what if you actually didn't accelerate? Now most theories involve things like hyperspace, timespace tears, etc. My idea is to use rotation. Now, if you would normally have a super-light weight stick of say, 5,000,000,000 miles, you could rotate it very fast with relative ease. Let's say the "Stick" is 1 KG heavy for speculation. However.. The energy needed to accelerate at light speed would keep increasing, making it's relative mass higher and higher. Even if the end tip would be spinning at 290,000 KM/second, it would be around 1,3 KG. But the closer you approached C, …

What are people's views on the theory that the universe could be fractal rather than uniform?

I found this applet on airfoils and other types of lift methods: http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html seems like it is all based on the angle of attack and the curvature of the wing. BUT... I want to make one with the most possible lift and the least possible drag. Which shape is the best? If you can do it on the applet, give me the values or a screenshot so I can reproduce it. Thanxo!!!!

In these systems the field effect can be manipulated by the craft so as to effect electrical system not directly connected to the vehicle, causing these systems to fail. The effect is described by the dictionary description of electromotive force as " A field which can energize external circuits." Much like the way Active Radar defeating systems operate, by matching the radar energy and cancelling it out, an electromotive system can match the frequency of external circuits and cancel out there operation or energize them to a blow out level. UFO's have long established this ability and demonstrated this effect. So it serves that they operate on an electromotive force…

Hi! What is the speed of electric flow? I mean not a speed of electron drift, but a speed of spreading of electric perturbation over normal metallic wire? Can you explain prove your answer or give some links to experimental data? Thanks.

Can you use normal lenses outside the visible spectrum? What wavelengths can they be used with?

Thease are the "Physics for Future Presidents" Lectures, streamed over google video from the university of california. http://video.google.co.uk/videosearch?q=Physics+for+Future+Presidents Go find one that intrests you, they are really good :¬)

I am trying to grasp a concept or concepts a bit better visually and I thought via this question that I could get a good start into such. If you have photons being emitted in say a box made of matter, though the box itself is not emitting the photons, why is it exactly that the light never escapes this shape to outside of it? Or is redirected back into the box? Is some other kind of energy emitted outside of the box as it is hit by the photons? Basically another example is if you have a sealed box, and you turn a light on inside of it, will any of the energy or light ever be able to get outside of the box? I am trying to understand I guess how a sealed box o…

What is the difference between a point charge [math] q [/math] and a test charge [math] q_0 [/math] ? When dealing with electric potential, my book gives one equation when dealing with a test charge: [math] V = EPE/q_0 [/math] and one when dealing with a point charge: [math] V = kq/r [/math] Why is there a difference between the two?

How, you ask? Well, i figured out how to do FTL communication. It's not realistic at the moment (Since the power needed for it would just be too great.). The idea is to use powerfull gravity, and make fast fluctuations in mass that causes the gravity, and measure the fluctuations in gravity where you're sending the message. Of course, do directly change the mass of something, you need to get rid of matter, which is impossible. But there is a backdoor around this: Antimater. Bombard the high-density matter with antimatter, causing it to anihilate (Meaning it is turned into energy, changing the mass.). The technical problem here is creating enough antimatter. If you…

I need some explanation of how it works.....

Gravity effect in water on items Then I take a egg and drop it in water and then it goes down. By adding salt to the water and waiting for it to dissolve will make the egg rise. The surrounding area around the egg has changed and the gravity effect has been altered. So why does Salt does the trick? Can I use other things two?

Ways of producing “Free” energy from nature Ok, someone told me this: “Actually you can produce H with a magnifying glass. Focus lens to small point on iron plate submerged under thin layer of water. O bonds with Fe, H is freed. Capture H in test tube and light it off. Wow the kiddies with this.” Will that work? ///////////////////////////// Solar power has a very low efficiency, but it’s there Wind power is cool but, it’s not a play in the park to set it up and it must have protection from over speeding then the wind is going on steroids. And it looks crap Tidal power, from tides, it looks crap Hydro is cool, you must trap some million li…