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Homework Help: Niagra Falls Q

  1. Jun 2, 2010 #1
    1. The problem statement, all variables and given/known data
    Estimate E generated by water falling over Niagara falls in 5 day.
    Height = 150m
    Water flow =104m3/sec
    t=5x24x60x60=4320000sec


    2. Relevant equations
    P=W/t
    mgh=mv2/2


    3. The attempt at a solution
    Work=mgh=m(9.8)(150)
    Time=432000seconds
    P=m(1470)/4320000

    I just don't know how to convert 104m3/sec into a mass
     
  2. jcsd
  3. Jun 2, 2010 #2
    The density of water is ~1000kgm[tex]^{-3}[/tex].

    You can use this to work out the mass flowing per second.
     
  4. Jun 2, 2010 #3
    Alright niceee thanks for the help :)
     
  5. Jun 2, 2010 #4
    No problemo :)
     
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