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Air, with density of 0.00237 slug/ft3 and a kinematic viscosity of 0.000157 ft2/s, is forced through...

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Mechanical Engineering

Air, with density of 0.00237 slug/ft3 and a kinematicviscosity of 0.000157 ft2/s, is forced through ahorizontal square 9-by 9-in duct 100 ft long at 25ft3/s. Find the pressure drop if the relative roughnessis 0.0003 ft.

Select one:

a.
5.5 lbf/ft2

b. 1.5 lbf/ft2

c. 40 lbf/ft2

d. 15 lbf/ft2

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