Users' Guide User guide

120 Newton’s Law of Cooling

c) To insert the function e^, press to open the Functions menu, use

the arrow keys to highlight e^, and press .

Also open the Functions menu to select and insert the pair of parenthe-

ses.

d) The Calculator will prompt you to enter the values of k and t. (It does

not prompt you for r

because you entered that constant in step 5.)

e) Enter the value of k that you found in step 7 and press .

f) Time is the variable that will be plotted on the horizontal axis, so do not

enter a value for t.

9. Compare collected relative temperature data with the modeled data.

a) Press to return to the Home Screen; press to open the Graph

display.

b) Press to open the Graphs menu; press to select New Graph

Page.

c) Press twice to highlight the data source menu. From the menu,

select r (the collected data).

d) Press to open the Graphs menu; press to select Two Measure-

ments mode.

e) Press to turn on the highlight, then press the left arrow key repeat-

edly until the second data source (on the right side of the Graph) is high-

lighted.

f) Press to open the data source menu and select r model.

10. Does the modeled equation agree with the collected data? If it deviates,

can you explain why?

parentheses

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