A farm water sprinkler is dead headed the pipe raduis is 4, Ask an Expert

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A farm water sprinkler is dead headed .the pipe raduis is 4 inches. The hight of the water 20 ft. the kinemitcs viscosity of the air is 1.4x10^-5.air density 1.23kg/m³. water density 1000 kg/m³. What is the averge stress when the pressure drop is 38 psi over the entier lenght of the pipe?

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