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  1. I

    Regarding Space surrounding the earth

    You'd fart. :P I read while back about a guy that actually survived being in a vacuum for 30 seconds, i think it was for testing a suit or something, it was damaged and he lost pressure for 30 seconds before they were able to repressurise the vacuum chamber. Alot of the common myths like...
  2. I

    antimatter weapons

    I doubt the energy release would be linear, as soon as the first bit of antimatter reacted with matter it would release radiation and heat the rest of the antimatter, which would expand at a huge rate, the hotter the antimatter gets the faster it's travelling and the faster the reaction. Granted...
  3. I

    antimatter weapons

    You realise that they don't exist right? You'll probably never see any kind of weapon in the form of a gun if that's what you're hoping, the only possible use for antimatter is a bomb, and one hell of an unstable bomb at that. They're unlikely to ever be practical though, since the antimatter...
  4. I

    Pressure at the center of the Earth?

    Interesting thought, I suspect the pressure would rise dramatically as you drop, there'll be a point where the air could be approximated to be incompressible (if we considered it compressible at 360GPa then its density would be in the region of 4 million kg/m3 according to ideal gas laws!!). It...
  5. I

    how does an SLR outperform a non-SLR

    So DSLR cameras still use a mirror, right? does this mean it actually has 2 sensors in it, one for the image capture and one for the preview? or do they just not give you a preview and you use the viewfinder?
  6. I

    Absorbtion of microwaves in water

    Hi, basically i have a piece of coursework in which a potato is being heated in a convention oven and also a microwave, I've got to model the system using finite difference heat transfer equations. I've done all that fine, the only thing I can't get is the heat generation in a microwave. Now...
  7. I

    The moon, you and a little red button

    If you don't have an unexplainable urge to destroy the moon, there's definitely something wrong with you. :)
  8. I

    The moon, you and a little red button

    Well earths escape velocity is about 11.2km/s, and the moon has a mass of 7.36 × 10^22 kg, with a velocity of 3,700kmph (1030m/s). That means you'd need about 3.806x10^30 J of energy to knock it out of orbit. That's about 910 exatons TNT, quite a long way short of a yottaton TNT. That's assuming...
  9. I

    A space centrifuge...

    Hehe, I know the idea's been around for a long time, I couldn't tell u who first thought it up though. I don't think there's enough benefit from building one at the moment when weighed up against the cost, altho spinning a station on the end of a long cable with a counterweight on the end might...
  10. I

    A space centrifuge...

    I was thinking the other day about how feasable a spinning disc (like in Halo...) or torus would actually be. I'm talking about a relatively small scale one, less than 100 meters in diameter, anything bigger would be quite weighty and very difficult to build. After thinking for a while, i...
  11. I

    why can't heat be used to create energy?

    Isn't there a simple solution to this, by keeping the water in a vapour phase? Burning fuel creates water anyway, and that doesn't do much damage because it's superheated...
  12. I

    Case = heat = energy?

    As already stated, it's impossible to power your own computer (unless it was a superconducting computer, which could be interesting, although still very unlikely that would work). If you wanted to collect the waste energy, it'll be a pretty feeble ammount. The maximum efficiency of a generator...
  13. I

    Why "60 Terahertz" for conciousness ?

    I don't think you can assign a speed to a brain, since it's not a digital system. People have tried many times to approximate its speed, which vary a huge ammount. If you measure speed as the number of chemical reactions contributing to thought it may well be in the terahertz range, but if you...
  14. I

    Which color is the fastest?

    Well according to this advert from the 1990s, the blue car won (because the red car just couldn't carry on). End of discussion :P
  15. I

    about downloads

    Yeh, it's only with progressive jpgs it does this I believe. Progressive jpgs save alternate lines first, then the ones in between, so you can get the idea of what the whole picture's going to look like while having downloaded only a half of it, although it means the picture has low detail until...
  16. I

    The Man who invented SATA is comming to My house shortly

    'Am I sad for getting excited about meeting the inventor of SATA?' :P Maybe I'm just not geeky enough, or maybe I'm missing something?
  17. I

    What's it called??? whimshurst generator

    Wimshursts work quite differently to van de graaff machines, doesn't work on friction, but rather by clever use of em fields and the charge of electrons. I think. I won my schools science award last year (for getting a C in physics at A level lol, best grade anyone got in any science subject...
  18. I

    Artificial Gravity

    Hmm, I don't know why 'things' become lighter, I believe they could get heavier though, as the particles are travelling near the speed of light, according to relativity the faster a particle is travelling, the more mass it has. The closer the particles get to c, the closer to infinity the mass...
  19. I

    how are we going to get into space cheaply in the future?

    Still don't understand how everyone thinks that antimatter can be used to generate electricity, since the stuff doesn't exist naturally we have to make it first, it's essentially just a way of storing energy. If you're suggesting using it as a method of propulsion, I wouldn't dare use it in...
  20. I

    how are we going to get into space cheaply in the future?

    I agree, there's no new technologies to take over chemical rockets on the horizon, anything else is still pure science fiction. If you want cheap space flight, you need to move away from NASA, they're obsession with safety has resulted in a crippled space program that hasn't moved forwards...
  21. I

    Why aren't NASA, etc. building mass drivers?

    I've read an article on using mass drivers to launch space vehicles, one of the things it pointed out was that any horizontal velocity that the vehicle has when it leaves the tracks is essentially wasted, it can't make use of it like a plane can. For this reason it should be launched as near to...
  22. I

    Fly in a Car

    If the car's travelling at constant speed, the fly will remain stationary with respect to the car, since it's in equilibrium (no wind resistance, since the car is pretty much sealed). However, if the car is accelarating, the fly should travel towards the windows, although the fly may well be...
  23. I

    black hole in space

    Pfft, that'd be a waste of tin foil, why not use it to cover the moon, or make 5,000,000,000,000,000 baked potatoes?
  24. I

    Things We Can Do To The Moon

    There's a problem though, there's no air on the moon so the fan wouldn't work! Perhaps water cooling...
  25. I

    About Bandwidth

    Well that computer could be using a RAID array, or it could just be that it can sustain that transfer rate for a small ammount of time because the information is stored in the RAM.
  26. I

    Another free energy hoax?

    Reputable sources??? Only one of them looks remotely reputable, one of them is from a site that advertises anti gravity machines! There's so much science against these concepts, it puzzles me how anyone actually believes the crackpots...
  27. I

    2 + 2 = 5 for extremely large values of 2.

    What, like 2.4 + 2.4 = 4.8, when rounded it becomes 2 + 2 = 5? Seems a bit silly to me :P
  28. I

    Space Elevators

    Umm, read the thread, they will work (theoretically anyway), it's already been explained. The cable above geosync would act to hold the bottom part up, so long as your cable's strong enough and the mass about geosync is high enough, it'll work. I imagine people will start actually looking at the...
  29. I

    Space Elevators

    Lol, I remember them! I also seem to remember they'd cause disasters every so often when the beam missed the dish :P Unipidity, I suggested before that the beam was only used above the atmosphere, transmitted from a station at geosychronous orbit, so there's no need to worry about atmospheric...
  30. I

    Space Elevators

    Say again? What's the sheathing you're talking about? A superconducting cable would only be at all feasable if no cooling equipment was required, meaning it has to operate at the temperatures the cable would experience. Even if a superconducter is invented that can handle the conditions is...
  31. I

    Space Elevators

    Pump N2 around a superconducting cable? Can you imagine how heavy all the piping would be? And how would you go about pumping it all there in the first place? A really HTSC would be a bit more feasable, but it would add thousands of tons to the weight of the structure that isn't really...
  32. I

    Space Elevators

    Yeh, pretty much. Space elevators will have very gradual accelaration compared to rockets, so by the time it's hit a decent speed it's waaaay out of the atmosphere. On the way back, it will start decellarating before it hits the atmosphere, probably going at no more than a couple of hundred kph...
  33. I

    Space Elevators

    Couldn't satellites over time be put into orbits would never collide with the cable? I don't really know anything about satellite orbits, I'm sure there's someone out there who knows. Also, how common would it be for a satellite to come within, say, a mile of the cable (with the number of...
  34. I

    Space Elevators

    Lol, doubt it'd travelling slower than a person walking, how many people can walk 40,000km in 3 days???
  35. I

    Space Elevators

    Nuclear is a possibility, there might be alot of people against it though, everyone's frightened to death of nuclear devices. But fusion? Doubt it somehow, the ones in development at the moment are nowhere near operational, I doubt anyone will even reach ignition for another decade at least...
  36. I

    Space Elevators

    If they manage to create the cable so that the resistance is low enough, it'd be a great way of powering the climbers, but I doubt they could do that reliably. Solar power also aint really an option as you need alot of panels to drive the climbers, they'll probably be carrying a good few tons...
  37. I

    Space Elevators

    Hmm, I'd have thought manufacturing the stuff would be pretty complex, current methods employ lasers and high temperatures, something capable of producing it would probably weigh hundreds, if not thousands of tons, would it not just be easier to make it on earth and then launch it into space?
  38. I

    Space Elevators

    I've thought about about running power cables up it, but there's 2 problems with that, first of all electric cable weighs alot, it could easily be heavier than the actual elevator cable. Second, when you've got a several thousand km long electric cable, the resistance becomes fairly high (or...
  39. I

    Alternatives to magnetic primary storage

    A few weeks ago a company released the first prototype of a holographics storage drive, I don't think there were any moving parts in it (apart from maybe a lens), so it has the potential to access data much faster than hard drives. They also claim it could store over a TB of information, which...
  40. I

    Space Elevators

    For those of you that don't know, a space elevator is a way of getting into orbit by climbing a huge, ultra stong cable that's teathered to earth, the other end floating in space, the spin of the earth would mean that the cable would straighten and support itself. I've read a few estimates of...
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