Calculating Gauge Pressure in a Two-Story House

[wallace13]

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

 

[LowlyPion]

Looks OK.

 

[The Motif]

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.