5.50 A variable mesh screen produces a linear and axisymmet- ric velocity profile as indicated in Fig. P5.50 in the air flow through a 2-ft-diameter circular cross-sectional duct. The static pressures upstream and downstream of the screen are 0.2 and 0.15 psi and are uniformly distributed over the flow cross-sectional area. Neglecting the force exerted by the duct wall on the flow- ing air, calculate the screen drag force. D = 2 ft Section (1) P₁ = 0.2 psi V₁-100 ft/s Variable mesh screen Section (2) P₂= 0.15 psi

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?