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Homework Help: Physics projectile problem

  1. Sep 15, 2004 #1
    physics projectile problem....

    A fire hose held near the gound shotts water at a speed of 6.8m/s. At what angle(s) should the nozzle point in order that the water would land 3.0m away?
    It asks for 2 different angles.

    Any help would be great. Thank you.
     
  2. jcsd
  3. Sep 15, 2004 #2

    ShawnD

    User Avatar
    Science Advisor

    Make an equation showing the time spent in the air using the distance formula. This is overall vertical distance (0).

    d = Vi*t + (1/2)*a*t^2

    d is 0, Vi should be 6.8*sin(theta), a is just -9.80. Try to isolate the time. From the looks of it, the time will equal something * sin(theta).

    From there, do horizontal distance

    d = Vi*t

    d is 3, Vi is 6.8*cos(theta), and t is the equation created above. You should end with sin(theta)*cos(theta) = something. From there you can probably just graph it.
     
    Last edited: Sep 15, 2004
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