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A Java applet that allows one to interactively analyze (graphically) second order differential equations.
One-page introduction into Laplace Transforms with text references
This is a CDF file and requires Wolfram's free CDF Player plugin for your browser.
This webpage presents, in Mathematica format and links, a very sophisticated and formal presentation of Laplace transforms.
Demonstration of radioactive decay of C14 and its relationship to time. This resource requires download of the Wolfram Demonstrations Project (120MB).
The site contains many examples of spring-mass system using Mathematica. Examples must be downloaded to be used.
This maplet combines visualization, mixing word problems, and then fill in the blank values/functions for the maplet.

This Java applet provides an approximate graphical solution for a first-order IVP entered by the user in the form \(dy/dx\).

This applet allows one to change the frequency of two waves between 5 and 20 Hz with a slider scale as well as classify the waves as in or out of phase. You obtain the wave motion over time.

This site contains notes for a variety of elementary differential equations topics.  Headings of major sections include: first order, second order (including series solutions