1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help Kinematics in 2d Question!

  1. Sep 16, 2005 #1
    Help!! Kinematics in 2d Question!

    Suppose the water at the top of Niagara Falls has a horizontal speed of 1.23 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 49.4 degrees angle below the horizontal?
     
  2. jcsd
  3. Sep 16, 2005 #2
    The angle is given as 49.4degrees...
    And you know that tan of an angle will be y/x, and you're given the x velocity component, 1.23m/s...
    Now, you can form an equation...
    tan 49.4 = Vy/1.23
    Solve it for Vy... (Vy is that final vertical velocity)
    Then, to find the vertical displacement, use the formula (Vy)^2 = u^2 + 2gy given Vy, g and u. (It's a waterfall... so vertical velocity is assumably initially 0m/s)
    Solve it for y. :}
     
  4. Sep 16, 2005 #3
    Oh..

    Hey thanks for your help man ... BUT ... i got it wrong ..andi failed ..
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Help Kinematics in 2d Question!
  1. 2d Kinematics help (Replies: 3)

Loading...