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The contaminant starts entering the lake at a more or less steady rate when the plant starts operations, at a time we might call t 0. It stays at that steady rate for the forseable future. So the best choice for an input function would be the step input function as shown below:

Sinusoidal Graph

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John Hoggard <hoggard@math.vt.edu>
Last modified: Tue Aug 12 23:00:49 EDT 1997