Physics

Not sure if this is the right area to post this question… But if the ISS is going to weigh 1,000,000 pounds when complete (500,000KG’s). How do they intend to keep it up in up orbit? From my understanding, every time the Shuttle leaves, it uses it’s boosters to ‘elevate’ the ISS. So when, and if the ISS reaches this weight. How do they intend to move this mass upwards? Or do they just intend to have extra fuel for the boosters for longer burn time? On those lines I would say that they will have a ‘Booster’ craft solely designed to elevate the ISS – maybe launched every 6 months when the Shuttle retires in 2010.

Scifi comes to life in this new creation: http://www.engadget.com/2008/06/13/scientists-create-cloak-of-silence-serial-killing-will-neve/ The only thing I thought was a bit disturbing was the title Engadget chose to portray (serial killers.. wonderul). Sounds pretty awesome... but it's not yet developed Also, I was thinking - soundwaves travel through a medium ONLY (air, water, whatever) and do not travel in a vacuum. Won't it be simpler to create a thin layer of vaccuum on the windows, in the walls, and - voila - no sound passing through? The entire 'tubes / meta crystals' angle sounds a bit over-the-top for me.. What do you guys think?

if both positive and negative matter exist in our universe, what would an antiverse/negaverse be composed of?

i've always thought it would be impossible to freeze fire. but the question stuck in my mind this morning, and i've been thinking about it all day. could you do it? fire needs heat, fuel, and oxygen to continue to burn. let's assume you have a fuel source that is small, but burns for a very long time. the fire will keep burning as long as it has air because it produces its own heat. could you freeze a fire in oxygen?

i've always been taught that the Earth's core has 2 parts: an outer and inner. the outer is supposed to be liquid, but the inner is solid. the way i've learned it is that the inner core is so hot, it is a solid instead of a liquid. but my understanding of thermodynamics contradicts this. how can a liquid become solid by heating? if this is so, would zero Kelvin be liquid instead of solid? or something even colder than zero Kelvin?

has anyone ever heard of this? any input would be helpful.

Hi, Is there any physics theory where heat generated from a source can be made to displace water in metallic pipes when heated from one end to another!???? Like for moving an object like ship by this theory! --------------- eric

Just have a quick capacitor question. How does one find the amperage of a charged cap. Say if I had 120volt 30 micro farad cap, how would I find the amperage produced if discharged? Another question, what about if there were 5 caps lined up in parallel, then what's the amperage? A formula would be fantastic, I've tried looking online but I can't seem to get a straight answer.

I recently read a thread about information, and it got me thinking. Can information be totally destroyed? Several people I ask said no, but while wondering about this, I was also reading a bit about black holes, and I was thinking, couldn't black holes completely destroy information? What about the information released in Hawking Radiation, could it be pieced back together somehow? Or is it completely scrambled? I apologize if this has been asked before, I had a thread before about black holes, and I asked this question, but the only answer I got was "google it". Thanks for any answers

Hello guys, is there anyone who can help me with this motion question I know how do it but I don't know why they do it like this I'll write my question An identical rocketrthat provides a constant force of 22 N (acceleartion=34 m/s/s) is now launched horizontally from the top of a 50 m tall bulding. Assume that in its subsequent motion the rocket always points horizontally. After 1.5 s what is the speed of the rocket. and at what angle is the rocket moving relative to the ground. I got the answers. The speed is 68 and the angle is 12 degress. You can get that from working out the vertical and horizontal components in the force. But how can there be a vertical componen…

Been doing a compulsory Enterprise module for the last few months. One of the projects was based on idea stimulation, just trying to get the creative juices going. At the end of it I presented a fun product concept riddled with both technical and marketing problems. -A Music Suit! Full design and mass production would require endless funds, time and effort, all for a big risk. So all I want to do is make 1 model. Basically, its just a wetsuit (not entirely necessary) with lots of movement detectors strapped to the limbs, fingers etc. The original concept was for use on 'garageband' and as a general input device for computers (Minority report anyone..?). There is a pa…

If you were to build a ring, inset that ring with another ring set on foil bearings, rotate the inner ring at an extreme speeds - assuming the outter ring remains fixed - would that structure in it's entirety have a greater compressive strength than the same structure in an immobile state? Constructed entirely (mind the foil) of epoxied carbon fiber, where the extreme strength is tensile, could it be a super light circular structure capable of withstanding extreme pressure (to the tensile strength of the fiber)? (putting aside the obvious energy needs for the moment) Thanks, Bobby

This may seem strange but I never understood the actual mechanism by which things sink and float. For instance, layers of air: Why should cool air sink? I know that it is denser, because that is the reason that is taught in elementary school, but just because it is denser doesn't mean the force of gravity is any stronger upon it. It just was never clear to me.

This doubt arised in me just when i was holidaying with my parents in the car. A huge load in the trunk made the car to move slow. this means, mass is inversely proprotional to velocity. But then i suddenly thought of einstein's theory. What he said was that ,when an object acquires the speed of light, its mass becomes infinite. Doesn't it mean that mass is directly proportional to velocity. Can anyone pls clear it to me in a liberal way as i am only a school student and cant understand complex terms...

This may sound like a very strange question to ask, but since heat is a result of atoms/molecules in an object vibrating. Is it possible for something to have such a high temperature that the vibrations of the molecules will be enough to produce an audiable sound that a person could hear a perhaps a humming sound?

I am looking for Companies that may have the capacity to place a scintillation layer (a-Si or a-Se) onto a CMOS sensor to be used for X-radiation imaging.

Hi, I was doing some Physics homework on light, and just thought of something. Well, I am sure, this has already been thought of, but I couldnt find anything on the internet. So I was wondering if anyone on here could maybe tell me if it is possible. Firstly, the speed of light is a constant? Right? Well, lets say, light from the sun hits the earth, does some reflect off and go back into space? If yes, then, lets say that light leaving earth travels 1million light years, and reaches a reflective planet/star, maybe an ice planet/star, could it be possible for that light to reflect back to earth? Taking another 1million years to reach back to earth, it could…

The spiraling increase in the demand for biofuel with decrease in the sources of fossil fuel has now initiated large and small scale farmers to go with a new wonder crop called Jatropha Curcas. Jatropha curcas L. has proved to be a promising oil-bearing tree, which grows well even in the arid and semi-arid regions, particularly on the degraded lands and lands affected by moving sands, . The seeds of this Euphorbiaceae tree contain more than 30 % oil, which can be used for making bio-diesel. The seed cake produced after oil expulsion is rich in nitrogen (> 5 %), phosphorus (>2.5% P2O5) and potassium (1% K2O) and can be converted into valuable organic manure for …

I was discussing lightbulbs the other day, and suddenly we realized that we don't know what resistance is. I know the V = I*R laws and other basics. I know that the wire in a lightbulb glows bright because all energy of electrons is lost in the wire because it is thin and therefore has a (relatively) high resistance. Let's look at a DC current in a wire (or any other resistor, they all just heat up to dissipate the energy). So, these electrons entering the wire lose their energy somehow. I'm visualizing it as high energy electrons in the valence band getting too close to another electron in the valance band, pushing the next one forward. That one in turn pus…

The ionization energy of H is 13.6 eV With that information how can I estimate the volage I need to apply to 2 electrode in a H gas in order to get H+ ions ? What is happening to the electrons ? Can I get 100% of the H atom ionized? Thanks

I need to understand the relation between volt (V) and electronvolt (eV) in a system with particle and electric field. Let say that we have 2 larges plates in a vacuum and two test charged particle a proton and an electron. The distance between the plates is 1 meter. The electric potential between the plates is 100 volt and the charge of the particles are +1 and -1 elementary charge. If the plate are large enought the electric field gradian is constant in the middle betwen the plate. An electron at the negative plate will experience a force toward positive plate. I am tempted to tell that the electron will have an energy of 100 eV when it hit the positive plate. Is…

How fast are electrons moving when they leave the electric wall socket in your house (240V in the UK)?

I would like to define time as the "speed of one entity in relationship to the speed of another entity" i.e. It takes her 1 hour to walk around the block. (her speed in relation to the speed of the clock.) Where problems arise is when we use the word "time" in the abstract: "The time it takes for the earth to go around the sun is one year." The above statement has nothing to do with time but is the definition of a year, i.e. When the earth goes around the sun we call it a year. Yes, yes, Quarks Rule!!

I was wondering if it has ever been found successul to extinguish an electrical fire with salt water??? and I was wondering if this could be applied to an energized t.v. or computer fire. I would like to hear all pertinent information please and plesase include a reference source for verifcation of info thank you!!!!

The maths used in Statistical physics are remarkably similar to the maths used in my field of study, and I would really like to get a good introduction to statistical physics, any good textbook ?