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Why is this wrong THRUST? i showed work!

  1. Apr 20, 2008 #1
    why is this wrong...THRUST?? i showed work!

    1. The problem statement, all variables and given/known data

    A rocket for use in deep space is to have the capability of boosting a total load (payload plus the rocket frame and engine) of 2.25 metric tons to a speed of 10 000 m/s.
    If a different fuel and engine design could give an exhaust speed of 4600 m/s, what amount of fuel and oxidizer would be required for the same task?
    metric tons

    2. Relevant equations

    vf=ve ln(mi/mf)

    3. The attempt at a solution

    x= 19.71
    but its wrong. can you help?
  2. jcsd
  3. Apr 20, 2008 #2

    D H

    Staff: Mentor

    The question asks for the amount of fuel and oxidizer, not the total mass of the vehicle.
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