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## Homework Statement

Water in an irrigation ditch of width w = 3.0 m and depth d = 2.0 m

flows with a speed of 0.40 m/s. For each case, sketch the situation,

then find the mass flux through the surface: (a) a surface of area wd,

entirely in the water, perpendicular to the flow; (b) a surface with area

3wd/2, of which wd is in the water, perpendicular to the flow; (c) a

surface of area wd/2, entirely in the water, perpendicular to the flow;

(d) a surface of area wd, half in the water and half out, perpendicular

to the flow; (e) a surface of area wd, entirely in the water, with its

normal 30 from the direction of the flow.

## Homework Equations

## The Attempt at a Solution

The section we are learning is the divergence theorem, but I don't really see the relation between that and this problem. How can I go about approaching this?