| Physics for the Inquiring Mind [Phys 105] Fall 2003 |
[1] Read pages 171 and 172 in Volume I of McDermott.
[2] Do Exercise 3.2 on page 174 of McDermott.
[3] Either individually or in your groups, design an experiment to do the following:
(a) Determine the final temperature when a cylinder made of A at temperature B degrees Celsius is placed into a cup containing 100 mls of water at room temperature. The parameters A and B are assigned by group as per the table below.
Group
|
A
|
B
|
Red
|
Aluminum
|
50
|
Yellow
|
Aluminum
|
80
|
Blue
|
Aluminum
|
100
|
Mauve
|
Brass
|
50
|
Chartreuse
|
Brass
|
80
|
Green
|
Brass
|
100
|
|
(b) By looking at the temperature change of the water and knowing its mass, determine the number of calories that flowed from the cylinder into the water. |
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(c) By looking at the temperature change of the cylinder, determine the number of calories that flowed out of it for EACH DEGREE by which it changed temperature. |
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(d) Finally, determine the number of calories that flowed out of EACH GRAM of the cylinder for each degree by which it changed temperature. When you have done this, you have answered the question "How many calories are required to change the temperature of 1 gram of this substance (aluminum or brass) by one degree Celsius?". The answer for water was "1". Is it the same for these metals? |
HINTS: (1) You will definitely want to use Styrofoam cups to prevent heat loss during the mixing.
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(2) To heat up your cylinders, consider submerging them in a beaker of water, and then heating the water to the required temperature. |