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Thread: Water rocket problem

  1. #1 Water rocket problem 
    Forum Professor Zwolver's Avatar
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    At school we have a test, and we got information in advance. I figured some parts out, but i'm not sure if it's all in the right place. I hope some of you can help.

    The idea is as followed,

    We have a waterbottle and we want to shoot it up, it's filled with only air and water. There is a frictionless weight underneath, and a pin. A pump will put air inside the waterbottle at unknown pressure. If the pin is retracted the bottle will fly up, and the frictionless weight plus the water will get down.

    Vz = speed of the weight (cilinder) and water
    Vf = speed of the bottle
    Mz = mass of the weight (cilinder) plus water
    Mf = mass of the bottle
    Fz = gravity (g)
    H = Hight
    t = Air tension
    C = Volume

    0,5*Mz*(Vf-Fz)^2+Mf*Fz*H=t*C*(0,5*Mf*(Vz+Fz)^2)

    0,5*Mz*Vf^2=0,5*Mf*Vz^2

    Mz/Mf=Vf/Vz


    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  3. #2  
    Forum Professor Zwolver's Avatar
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    nobody?


    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
    Reply With Quote  
     

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