Texas Instruments TI-82 STATS Manual Book page 333

Procedure
(continued)
4. Press s to graph the equations. Watch closely as they
are plotted. Notice that the ball and the ferris wheel
passenger appear to be closest where the paths cross in the
top-right quadrant of the ferris wheel.
5. Press p. Change the viewing window to concentrate
on this portion of the graph.
Tmin=1
Tmax=3
Tstep=.03
6. Press r. After the graph is plotted, press ~ to move
near the point on the ferris wheel where the paths cross.
Notice the values of
7. Press † to move to the path of the ball. Notice the values of
and ( is unchanged). Notice where the cursor is located.
X Y T
This is the position of the ball when the ferris wheel
passenger passes the intersection. Did the ball or the
passenger reach the intersection first?
You can use r to, in effect, take snapshots in time and
explore the relative behavior of two objects in motion.
Xmin=0
Xmax=23.5
Xscl=10
, , and .
X Y T
Ymin=10
Ymax=25.5
Yscl=10
Applications 17–13