CBL Interfacing
Shivering Isn't Enough: Heat Conservation In Homeotherms
Processing The Data
Recording the Results (The procedure for analyzing the data
will be carried out in the same way for each of the two experiments.
If you are working in groups of 4, 2 students should work on each
calculator-one calculator has the animals with and without a fur
coat and the other calculator has the different shaped animals.
However, make sure to enter all the pertinent data from the other
experiment on your data sheet.)
Collecting Your Data From The CBL
- When the CBL reads done, the experiment is over, but the information
must be transferred to the calculator. To make the transfer perform
the following steps:
Press ENTER.
A menu will appear. Choose GET CBL DATA.
MAKE SURE CBL SHOWS DONE will appear. Press ENTER.
TIME IN L1, DATA IN L2, L3 will appear. Press ENTER.
A menu will appear. Choose VIEW GRAPHS.
Press 2nd, OFF, ON, GRAPH.
T.
Setting Up Your Plots
Plot1 (Expt I-non insulated animal; Expt II-Beaker)
Press 2nd, STAT PLOT.
A menu will appear. Choose Plot 1.
The screen shows Plot1. The following selections should be highlighted
by moving the cursor to the appropriate item and pressing ENTER.
On
Type: line graph
X lists:L1
Y list:L2
Mark:
.
Plot 2 (Expt. I-Insulated Animal; Expt. II-Graduated Cylinder)
Press 2nd, STAT PLOT.
A menu will appear. Choose Plot 2.
The screen shows Plot2. The following selections should be highlighted
by moving the cursor to the appropriate item and pressing ENTER.
On
Type:line graph
X lists:L1
Y list:L3
Mark:
.
Press GRAPH, Zoom, 9. The graphs for both the experimental and
the control should now show on your screen.
U.
Recording Your Plots
- The plots obtained in the experiment represents the change in
temperature with respect to time. For each experiment, if available,
use a TI-GRAPH LINK to print a hard copy of the graph; otherwise,
make a sketch of the graph on your data sheet.
Label each line on both of the graphs using a pencil. To label
some of the key points on the axes simply press TRACE. A flashing
X is at the beginning of Plot 1. The x and y numerical values
of that point are shown at the bottom of the screen. By arrowing
to the right you can move the flashing X along plot 1 getting
a few key points which will help you label your axes. To change
to Plot 2 simply arrow down. You can go back and forth along the
plots. The P1 or P2 in the upper right hand corner of the screen
will remind you of which plot you are on.
V.
Analyzing the Results
Finding the Slope of Each Line
Before starting this section you need to adjust your calculator
so that the numerical value of the slope is given with enough
decimal places.
Press MODE and arrow down to float. Then arrow right to 4. Press
ENTER.
Slope of Plot 1 (Expt. I-non insulated animal; Expt. II-Beaker)
Press STAT, arrow right, and choose LinReg (ax+b)
In the next instruction
DO TYPE THE COMMA (,).
Press 2nd L1, 2nd L2 ENTER. Several equations are shown. The slope
is given as a=.
Record the slopes on your data sheet. Be
sure to note if it is positive or negative.
Slope of Plot 2 (Expt. I-insulated animal; Expt. II-Graduated
Cylinder)
Press STAT, arrow right, and choose LinReg (ax+b)
In the next instruction
DO TYPE THE COMMA (,).
Press 2nd L1, 2nd L3 ENTER. Several equations are shown. The slope
is given as a=.
Record the slopes on your data sheet. Be
sure to note if it is positive or negative.
Note :
The steeper the temperature drop, the more negative the slope.
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