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Since I need to solve this quickly, i'll post here too

  1. Nov 2, 2008 #1
    Since I need to solve this quickly, i'll post here too!!

    1. The problem statement, all variables and given/known data
    Hi, guys.
    I did a project but questions are killing me right now.
    I was going all the tutorials but I really have no idea.
    What we did was water rocket project.
    Here are the data
    Ttotal - avg. 9.96 sec.
    Avg. Apogee - 2.94 sec.

    2. Relevant equations

    3. The attempt at a solution

    I need to find the v initial, ymax, and the maximum range.
    Here is how I did it

    For Vinitial
    DeltaY(0) =(Vinitial)(5.88)+(1/2)(-9.8)(5.88)^2
    Vinital = 28.8m/s
    5.88sec comes from avg. apogeeX2 ------> (2.94)(2)

    For Ymax,
    Ymax= (Vinital)(time)+(1/2)(-9.8)(time)
    = 42.3 m

    For maximum Range,
    I found out that cos 45 will give me maximum range so

    = 119.7 m

    Lastly, my teacher asked, "What role does the water play in making the rocket move?"
    He also asked for relevent formulas and a diagram illustrating the forces.
    Only thing we learned so far are Horizontal Projectil motion and free fall.
    I do not think we ever learned this.
    Can you please help me with this? Ive been working for entire day!!
    Thanks guys.
  2. jcsd
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