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Homework Help: How to solve for drag coefficient/terminal velocity?

  1. Oct 14, 2007 #1
    [SOLVED] How to solve for drag coefficient/terminal velocity?


    i was told by a classmate that all i need to do is take distance over time. :)

    thanks anyway

    I am doing a lab and I need to solve for both the drag coeffient and the terminal velocity for dropped coffee filters. I have values for the drop height (4.66m), (and also the resisitive force) the cross-sectional area (1.2 m^3), the time (varies, but let's say 1.47s), and the mass (also varies, will say .0046 kg), and also the density of air (1.2 kg/m^3). I can't seem to figure out the drag coeefecient or the terminal velocity, although my teacher seemed to indicate that the terminal velocity must be found first. Any help would be much appreciated.

    I have a feeling i must use Tao, if you know what that is. I believe it is 63% of the time it takes to reach terminal velocity. I also know the equation V = Vterm (1-e^(-t/tao)). but i don't know how to use it. Then there is the equation D = (2mg)/(Vterm^2*pA). Aany help would be great as i have been stumped for hours

    Please help me, I've tried a lot of things but how do you solve for two unknowns?
    Thanks in advance
    Last edited: Oct 14, 2007
  2. jcsd
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