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Let's take a quick three question quiz now on when to use each of the three models. Click on the answer you believe is correct. If you don't feel comfortable about which model to use, go to the section on modeling. (You can also refer to the previous page for a summary of the three input functions we are using.)

Question 1: A 50 gallon drum of gasoline gets knocked over into a river which feeds into a nearby lake. If we wish to model how this gasoline gets distributed in the lake, we should we model the spill as

  1. an impulse input function;
  2. a step input function;
  3. a sinusoidal input function.

John Hoggard <hoggard@math.vt.edu>
Last modified: Mon Aug 25 12:12:21 EDT 1997