Consider a system where a horizontal, laminar, separated flow of air and water at 100 kPa pressure and 20 C temperature are moving between two infinitely-sized parallel plates. The water flow is not forced, but is carried along by the air flow. The 'superficial velocity' of the air is 0.1 m/s (superficial velocity is volume flow rate / flow area, representing the average velocity of the flow). The depth of the water film is 2 mm and the thickness of the air layer is 5 mm. Use the multiphase balance equations and interfacial boundary conditions to derive the velocity profile in the air and water, with y=D0 being the interface between the two.

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State Plane Coordinate Systems

The state plane coordinate system (SPCS or SPS) is a collection of 124 coordinate systems or geographic zones prepared for particular regions of the U.S. Every state consists of one or more than one state plane zone, the boundaries of which generally follow the county lines. Inside the U.S., there are 110 zones in total, 10 more zones in Alaska, 5 in Hawaii, and 1 for Puerto Rico and US Virgin islands. The system is extensively used for geospatial and geographic data assembling by the state and local governments.