Question

underground water pipe: a water pipe is buried 10 meters underground. what is the hydrostatic pressure at this depth? (soil water density = 1000 kg/m³) p = pa
question 7 1 pts
flood wall: during a flood, a wall is subjected to water 4 meters high on one side. compute the hydrostatic pressure on the wall. (water density = 1000 kg/m³) p = pa

Explanation:

Step1: Recall hydrostatic - pressure formula

$P =
ho gh$, where $
ho$ is density, $g$ is acceleration due to gravity ($g = 9.8\ m/s^{2}$), and $h$ is depth.

Step2: Calculate pressure for the first case (under - ground water pipe)

For the underground water pipe, $
ho = 1000\ kg/m^{3}$, $g = 9.8\ m/s^{2}$, $h = 10\ m$. Then $P_1=
ho gh=1000\times9.8\times10 = 98000\ Pa$.

Step3: Calculate pressure for the second case (flood wall)

For the flood wall, $
ho = 1000\ kg/m^{3}$, $g = 9.8\ m/s^{2}$, $h = 4\ m$. Then $P_2=
ho gh=1000\times9.8\times4=39200\ Pa$.

Answer:

For the underground water pipe: $98000$ Pa
For the flood wall: $39200$ Pa