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Homework Help: Rocket propulsion

  1. Jan 7, 2009 #1
    1. The problem statement, all variables and given/known data

    A Roadrunner F45 rocket engine, of mass 93g, is attached to a 2kg cylinder, which glides along a horizontal low friction nylon fishing wire. The thrust curve for the rocket engine is given.

    In reality, 30g of propellant are burned as the engine is ignited. Calculate the average of mass loss R during burnout, in kg/s

    2. Relevant equations

    R= Ma/Vrel

    3. The attempt at a solution

    I guess Ma is the average thrust which I could calculate by using the graph. However, I don't know how to calculate V rel ( which is actually the next part of the problem). Is there any way I can calculate R other than use the normal formula ??

    I have also calculated the impulse for the rocket.
  2. jcsd
  3. Jan 8, 2009 #2
    Anyone found out about anything yet ??

    I have been trying but still cannot find R without calculating Vrel
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