Monday, Feb 25, 2008

Handed back Oleic Acid Labs - discussed uncertainty calculations

Lectured on Heat Transfer
Conduction: molecular collisions and collisions between loose electrons in objects that are in direct contact.

Introduced idea of temperature reservoir
Deduced equation for heat flow
Showed that temperature profile in a uniform conductor is a straight line
Solved a problem to find junction temperature at the junction of two materials
Generalized to say that if the temperature difference is great (for the same thickness), the thermal conductivity is small.

Demo with star of different metals. On which does the wax melt first.

Convection
Demo with hot and cold water volcanoes.

Started Hewitt video on Heat Transfer.

Handed out RA 15.1 - due Tuesday