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Homework Help: Rocket Propulsion Question

  1. Mar 3, 2009 #1
    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 3.10 metric tons to a speed of 10 000 m/s.
    (a) It has an engine and fuel designed to produce an exhaust speed of 2000 m/s. How much fuel plus oxidizer is required?

    2. Relevant equations

    3. The attempt at a solution
    P = mv
    P = (3.10 metric tons) (10,000 m/s) = 31,000 metric tons m / s

    mv (total) = mv (fuel)
    31,000 metric tons m /s = m (2000 m/s)

    m= 15.5 metric tons

    ^^ This is not the correct answer.
    I just don't know where to go with this anymore...
  2. jcsd
  3. Mar 3, 2009 #2
    those two thing you wrote down as equal aren't, it would seem like you somehow need to quantify how much work a certain mass of fuel can do.
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