Water, with a density of rho = 1125 kg/m 3 rho=1125 kg/m3, flows in a horizontal pipe. In one segment of the pipe, the flow speed is v 1 = 6.53 m/s v1=6.53 m/s. In a second segment, the flow speed is v 2 = 1.17 m/s v2=1.17 m/s. What is the difference between the pressure in the second segment (P 2 P2) and the pressure in the first segment (P 1 P1) ?

Question

Physics

Alejandra Noble

14 August, 09:29

Water, with a density of rho = 1125 kg/m 3 rho=1125 kg/m3, flows in a horizontal pipe. In one segment of the pipe, the flow speed is v 1 = 6.53 m/s v1=6.53 m/s. In a second segment, the flow speed is v 2 = 1.17 m/s v2=1.17 m/s. What is the difference between the pressure in the second segment (P 2 P2) and the pressure in the first segment (P 1 P1) ?

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Gisselle Heath · Answer 1

The difference between the pressure in the second segment (P2) and the pressure in the first segment (P1) is 23262.75N/m^2

Explanation:

Density (rho) of water = 1125kg/m^3

Flow speed (v1) in the first segment = 6.53m/s

From the equations of motion

v^2 = u^2 + 2gh (v = 6.53m/s, u = 0m/s, g = 9.8m/s^2)

6.53^2 = 2*9.8*h

h = 42.6409/19.6 = 2.18m

P1 = h*rho*g = 2.18*1125*9.8 = 24034.5N/m^2

Flow speed (v2) in the second segment = 1.17m/s

v^2 = 2gh

h = v^2/2gh = 1.17^2/2*9.8 = 1.3689/19.6 = 0.070m

P2 = h*rho*g = 0.070*1125*9.8 = 771.75N/m^2

P2 - P1 = 24034.5N/m^2 - 771.75N/m^2 = 23262.75N/m^2