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Solve aplet 7-9
3. Use the Plot view to find an initial guess for T. First set
appropriate X and Y ranges in the Plot Setup. Since we
have an equation, , the plot will
produce two graphs: one for and one for
. Since we have set in
this example, one of the graphs will be .
Therefore, make the YRNG –5 to 35. Keep the XRNG
default of –6.5 to 6.5.
>6+,)7@
SETUP-PLOT
*e,>@5 >(17(5@
35 >(17(5@
4. Plot the graph.
>3/27@
5. Move the cursor near the positive (right-side)
intersection. This cursor value will be an initial guess for
T.
*A,to move cursor to
the intersection.
The two points of
intersection show that
there are two solutions
for this equation. However, only positive values for x
make sense, so we want to find the solution for the
intersection on the right side of the y-axis.
6. Return to the Numeric view.
>180@
Note: the T-value is filled
in with the position of the
cursor from the Plot
view.
7. Ensure that the T value is highlighted, and solve the
equation.
XVTAT
2
×+× 2⁄=
YX=
YVTAT
2
×+× 2⁄= X 30=
Y 30=