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Homework Help: Rocket in space

  1. Mar 18, 2008 #1
    1. The problem statement, all variables and given/known data
    If the rocket has an initial mass of 6000kg and ejects gas at a relative velocity of magnitude 2000m/s , how much gas must it eject in the first second to have an initial acceleration of 25.0m/s^2


    2. Relevant equations
    v=v_exln(m_0/m)


    3. The attempt at a solution

    i tried using momentum to solve the question
    6000(2000)=Ft, t=1s, F=12000000, then F=MA,so i 12000000=25m,
    m=480000
    but it was not correct
    then i tried to used the above v equation, but i don't have the v_ex
     
  2. jcsd
  3. Mar 18, 2008 #2
    You already have a thread on this very same question in this very same sub-forum.
     
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