Recent content by ice

  1. I

    Energy for Orbits: 500km Above Earth's Surface

    but isn't Ek=1/2 Ep for all orbits? i tried using v^2 = sqrt(2GM/r), which didnt really work out.
  2. I

    Energy for Orbits: 500km Above Earth's Surface

    This question came up on a quiz and i got it wrong. a)how much energy does it take to send a 1000kg object from the surface of the Earth to a height of 500km above the Earth's surface? b) how much energy does it take to put the same object into ORBIT at 500km above the surface of the earth...
  3. I

    How Do Strings Transform into Branes in String Theory?

    I was watching the Elegant Universe on PBS, and the show was talking about the string theory. there was one thing that i didnt really get though. It was the relation between strings and branes. I think i heard that if you were to add energy to a string, it gets bigger, and is stretched into a...
  4. I

    Energy = mass * c^2 where c=speed of light

    I was kind of wondering about the same thing. if light has energy and photons have no mass, it doesn't really work out if you were to put it into E=mc^2
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