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Pressure of water tank

  1. Jan 18, 2010 #1
    1. The problem statement, all variables and given/known data
    1)
    The water level in a large tank supplying a small town is 37m high. Water is pumped up for storage in the evenings and allowed to free-fall down as needed during the day. The street-level water pressure is...
    2) How high should a vertical pipe filled with water be if a gauge at its bottom is to read a pressure of 400kPa due only to the liquid?


    2. Relevant equations
    P= pgh = F/A


    3. The attempt at a solution
    1)
    answer: 36x 10^4 Pa
    2)
    answer: 3x 10^4 Pa

    I have been trying to get these right answers using the equations above..
    But, I have no idea..T_T
    Please help!
     
  2. jcsd
  3. Jan 18, 2010 #2

    PhanthomJay

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    Science Advisor
    Homework Helper
    Gold Member

    Re: Pressure

    yes
    I don't know what you did here, but the problem is asking for the height, when the pressure is 400 kPa (40x 10^4 Pa). Use the same equation you used for the first part. (you don't need to know F or A).
     
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