physics

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What equation should I used for a water bottle rocket lab?


I am using distance vs volume of water. Of course, the volume of water is my independent variable. What equation should I use for this lab?

  • physics -

    According to a Wiki article, the formula for the instantaneous thrust is
    F=2PAt
    where
    F=thrust
    P=pressure
    At=area of the nozzle

    Obviously the mass changes with time as well as the pressure. So both F, mass and P are functions of time, and you will need to integrate the resulting acceleration over time to get the distance.

    Do read through the safety precautions before attempting this lab.

    Ref:
    http://en.wikipedia.org/wiki/Water_rocket

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