*(please wait while the applet loads...)*

**Newton's Law of Cooling** models the cooling (or heating) of
an object which is placed in a surrounding medium (for example, a hot pizza that
is taken out of the oven and allowed to cool on the kitchen counter). The formula
is

where **u(x)** represents the temperature of the object at time **x**, **I**
is the initial temperature of the object, and **T** is the temperature of the
surrounding medium. **k** is a cooling rate determined by the physical nature
of the object, the container holding the object, etc.

The applet below illustrates the graph of **u(x)** and shows
how changes in the parameters **I**, **T**,** **and** k **affect the graph. Notice
that as time **x ->**, the temperature **u(x) ->** **T**,
the temperature of thesurrounding medium.The **red** graph is **u(x)**, and the **green** graph is the surrounding temperature **g(x)=T**. Use the sliders to explore the effect
of changing the values of the parameters.

*MultiGraph* applet written by David Eck (http://math.hws.edu/javamath/index.html)