Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.


    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


    User Avatar
    Homework Helper

    Think of impulse and change of momentum.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook