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Homework Help: Gauge Pressure

  1. Jan 14, 2009 #1
    The main water line enters a house on the first floor. The line has a gauge pressure of 2.00 x10^5 Pa.
    (a) A faucet on the second floor, 7.0 m above the first floor, is turned off. What is the gauge pressure at this faucet?

    P2= P1 + (density x g x h)

    (2 x 10^5)= P1 + (1000 x 9.81 x 7)

    P1= 131330 Pa
  2. jcsd
  3. Jan 14, 2009 #2


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    Looks OK.
  4. Jan 14, 2009 #3
    Ah, I see the error. Why is the pipe entering the house on the first floor? We all know pipes enter through the basement. Therefore, the height should be negative.
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