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Homework Help: Water falling = how much power?

  1. Feb 2, 2009 #1
    Water flows over a section of a waterfall at the rate of 3.2 104 kg/s and falls 33 m. How much power is generated by the falling water?

    i tried to use the power equation but im just not sure how the numbers relate.
    help please?
  2. jcsd
  3. Feb 2, 2009 #2


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    Homework Helper

    You need to calculate the rate of potential energy delivery which is m*g*h/sec.
  4. Feb 2, 2009 #3
    use energy:

    E[tex]_{gravitational}[/tex] before = E[tex]_{kinetic}[/tex] after

    The gravitational energy of the water is turned into kinetic energy

    the amount of power generated is the energy per second.
  5. Feb 2, 2009 #4
    thanks guys
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