 | Supercooling.pdf
This is an investigation of "super cooling." When thermal energy is
extracted from water at 0 degrees C, the temperature doesn't usually change.
The lost energy simply causes some of the water to freeze. If the energy
is extracted very slowly and the whole system is carefully kept at the same
temperature, there is no asymmetry to "tell the water" which molecules should
freeze. So, instead of freezing the temperature drops below the
freezing point. When the "super cooled" water is disturbed, freezing
rapidly occurs.
 | Movie of rapid freezing (1.3 Mb) This is
a clip from a video these students made as part of their term project.
This clip shows a test tube of supercooled water that they prepared.
In this movie they rapidly insert a metal rod which disturbs the water,
causing the water to freeze very rapidly.
|
|
 | Compression Ratios in the Otto
Cycle
Follow the link to see a presentation done by one of my students in class
(this is not the write-up that he handed in). His project explored how
engine efficiency depends on the compression ratio of the engine, as predicted
by our analysis of internal combustion engines in class. He did this by
machining a new head for his go-kart motor which would increase the
compression ratio of the engine. In the process he learned a lot of
physics and engineering, and also learned (and taught me) a lot about car
engines.
|
 | guitar.pdf
This is a study of the vibrations of a guitar string using a model which
includes a non-linear dispersion. The results are compared to a real
string using parameters extracted using Fourier analysis.
|
 | thermalexpansion.pdf
This is a study of the thermal expansion of water. Using a large
reservoir and a narrow straw, they were able to "amplify" the effect such that
very precise measurements could be made. They were able to verify that
water has a density maximum a few degrees above freezing.
|
 | oscillator.pdf
This is a different approach to the term project in which an aspect of the
course was studied in more depth theoretically. They do calculations
using the program "Maple" to investigate the effects of damping on a harmonic
oscillator. Note that the entire paper is a Maple workbook!
|
 | entropy.pdf
This student chose to write a java applet as part of his term project.
The applet, which demonstrates how entropy increases in a gas, can be seen by
following the link below:
entropy
applet |