Title: One Hot Puppy

Purpose:

Materials:

Overview:

Calibration of Barometer

Procedure:

  1. Connect the CBL to the TI-82 calculator and turn both of them on.
  2. >Attach the probes to the CBL. The barometer should be in CH1 and you will need to attach the CBL-DIN adapter. The temperature probe should be in CH2. Manually enter the intercept (K0,B) and the slope (K1,A).
  3. Select the PHYSICS program from the menu. Select "SET UP PROBES" You will use two probes in this exercise. Calibrate the pressure sensors using the calibration directions or manually enter the intercept (K0,B) and the slope (K1,A) as given by the teacher.
  4. Now you are ready to collect data. First monitor your data to make sure your probes are reading correctly. One likely problem is not calibrating the pressure sensor correctly. Press (+) when finished.
  5. Record.
  6. You will monitor the pressure and temperature changes in the closed vehicle for one hour. Select COLLECT DATA again and this time you will choose (2) TIME GRAPH. You need to decide on a proper sampling rate. The TI-82 can collect up to 99 data points while the CBL can collect up to 512 points. You need to decide on the time between samples and the number of samples you will collect during the time period. (Do you really want or need 500 data points?) The TI-82 will display the total time that samples will be collected. When you are ready to begin your experiment, press (1) USE TIME SET-UP. The CBL will begin sampling data once you press enter. Close the doors to the vehicle and wait one hour.

  7. When you return to your apparatus the CBL should read done. Follow the instructions on the calculator to view your data. Return to the classroom without turning off your apparatus.

Downloading Your Data to Graphical Analysis (GA)

To The Tech Center

Questions:

  1. Describe the Pressure vs. Time and Temperature vs. Time graphs.

  2. Describe the relationship between pressure and temperature in this experiment.

  3. According to your results, how long could the puppy remain in the car before becoming uncomfortable? When would the puppy enter the danger zone? How did you determine this?

  4. If you absolutely had to leave your animal in your car, what would you do to make sure it was safe from overheating?

Further Investigations

Sample Data from a Thirty Minute Time Period

Time
Temperature
Pressure
(sec)
(Celsius)
(mm)
1
24.70
758.3
2
23.68
760.0
3
24.07
758.3
4
24.44
758.3
5
24.95
758.3
6
25.2
758.3
7
25.45
758.3
8
25.71
758.3
9
26.09
758.3
10
26.34
758.3
11
26.72
756.5
12
27.10
756.5
13
27..48
756.5
...
...
...


Written by Susan Lowder, July 1997