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Eliptic orbit

  1. Oct 4, 2007 #1
    Can an airship rotate the Earth and the Earth is not in eliptical orbit's focus ?(can be in center?)
     
  2. jcsd
  3. Oct 4, 2007 #2

    mathman

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    If the airship is not powered, no, with the exception that a circular orbit will have the earth at the center.

    If the airship has some power to make flight path corrections, it could do anything it wants as far as the shape of the orbit, within physical limits.
     
  4. Oct 6, 2007 #3
    ok so, I read that mechanical energy(E): E=-MmG/R
    R=(a+b)/2
    a-semi-major axis
    b-semi-minor axis
    ,of course kinetical Ek=mv^2/2
    m-spaceship weight
    Ep=-mMG/r
    v^2/2-MG/r=-2MG/(a+b)
    and
    a-sqrt(a^2-b^2)=<r=<a+sqrt(a^2-b^2)
    and v^2 for some r is less than 0
    M>>m
     
  5. Oct 8, 2007 #4
    any comments?
     
  6. Oct 8, 2007 #5
    no,no delete this i made an error
     
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