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Homework Help: Calculating average force

  1. Jan 27, 2010 #1
    1. The problem statement, all variables and given/known data
    A stream of water strikes a stationary turbine blade, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the blade is 75.0 kg/s. Find the magnitude of the average force exerted on the water by the blade.

    07_11.gif

    2. Relevant equations
    kinematics equations
    (PEf - PE0)

    3. The attempt at a solution
    i have no idea where to start
     
  2. jcsd
  3. Jan 28, 2010 #2

    ehild

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    Homework Helper

    Think of impulse and change of momentum.

    ehild
     
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