11. Air enters a 10 m long section of a rectangular duct of cross section 25 cm x 16 cm made of commercial steel at 1 atm and 35°C at an average velocity of 7.5 m/s. disregarding the entrance effects, determine the fan power needed to overcome the pressure losses in this section of the duct. 10 m 16 cm Air 7.5 m/s 25 cm

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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?