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Pressure problem but without any given values. How?

  1. Nov 26, 2012 #1
    1. The problem statement, all variables and given/known data
    Both dams equally wide and equally high. The first dam holds back a very large lake, and the second dam holds back a narrow river.


    2. Relevant equations
    Which dam has to be built more strongly?
    a.) the first dam
    b.) the second dam
    c.) both


    3. The attempt at a solution

    i know it would be the second dam that holds back a narrow river, but how can i prove it mathematically/algebraically?
    how can i show the answer in ratio? -.-

    i need your help please.

    thanks!
     
  2. jcsd
  3. Nov 26, 2012 #2
    Do you know what the hydrostatic pressure is?
     
  4. Nov 26, 2012 #3
    yes. but my problem is, there is no any given values/numbers. i know what to answer but i can't prove it.. :(
     
  5. Nov 26, 2012 #4
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