1. Sketch the velocity vector V and the normal unit vector nn^ on each area.

(a) The free surface area of a water tank that is being drained.

(b) The inlet area of a turbine.

(c) The wall of a pipe.

(d ) The bottom of a canal.

(e) The inlet area to a cylindrical screen around a drain.

2. A rectangle surrounds a two-dimensional, stationary airfoil. It is at a distance from the airfoil on all sides. Sketch the box containing the airfoil along with the velocity vector V and the normal unit vector nn^ on all four sides of the rectangle.