Quest for the Nobel Prize competition
HW: work on problem set, do WebAssign problems
Next week: Newton's Law of Cooling Lab, Titanic Lab
Test on Friday
Friday, February 29, 2008
Thursday, February 28, 2008
Thursday, Feb 28, 2008
Went over RA 15.1, RA 16.1
IB students went off in pairs to do the Power of the Sun lab in the courtyard using the 200 W light bulb. The focus of this lab is on handling the uncertainty calculations.
The rest of the students worked on the Thermal Concepts problem sheet.
By popular watched the first 15 minutes of the Bill Nye video on Heat.
Assigned WebAssign Chapter 15 due Sunday evening.
IB students went off in pairs to do the Power of the Sun lab in the courtyard using the 200 W light bulb. The focus of this lab is on handling the uncertainty calculations.
The rest of the students worked on the Thermal Concepts problem sheet.
By popular watched the first 15 minutes of the Bill Nye video on Heat.
Assigned WebAssign Chapter 15 due Sunday evening.
Wednesday, February 27, 2008
Wednesday, Feb 27, 2008
Collected Heat Capacity Labs
Reviewed topics from yesterday - conduction, convection, radiation
Showed how to estimate the average temperature of the Earth assuming 30% reflection. Calculated 257 K.
Showed Hewitt video on Change of State
Discussed heating curve of water with phase changes.
Handed out RA 16.1 - due tomorrow
Assigned WebAssign Chapter 15 - Heat Transfer - due Sunday night
Reviewed topics from yesterday - conduction, convection, radiation
Showed how to estimate the average temperature of the Earth assuming 30% reflection. Calculated 257 K.
Showed Hewitt video on Change of State
Discussed heating curve of water with phase changes.
Handed out RA 16.1 - due tomorrow
Assigned WebAssign Chapter 15 - Heat Transfer - due Sunday night
Tuesday, February 26, 2008
Tuesday, Feb 26, 2008
Collected RA 15.1. Graded it while students finished watching the Hewitt video on Heat Transfer.
Demonstrated the wax brightness lab and showed how to do calculations. Described the lab to calculate the power output of the Sun which we will do the next bright sunny day.
Reviewed with class conduction, convection, and radiation. Gave examples of convection and how it affects onshore and offshore winds.
Introduced Wien's Law and the Stefan-Boltzmann Law. Showed how to use Wien's Law to get the wavelength of maximum emission. Used the Stefan-Boltzmann Law to show how the Intensity vs Wavelength curve various with temperature. At higher temperatures the wavelength of maximum emission shifts towards shorter wavelengths but an object at higher temperature emits more radiation at all wavelengths.
Discussed colors of stars and showed the Intensity (W/m^3) vs wavelength curves for various temperature stars.
Calculated the wavelength of maximum emission for a human. Showed how to calculate the power radiated by a human assuming emissivity = 1.
Talked briefly about the concept of a black body which is an object that absorbs at all wavelengths and emits at all wavelengths. Stars can be approximated as black bodies.
Heat Capacity Lab due tomorrow.
Demonstrated the wax brightness lab and showed how to do calculations. Described the lab to calculate the power output of the Sun which we will do the next bright sunny day.
Reviewed with class conduction, convection, and radiation. Gave examples of convection and how it affects onshore and offshore winds.
Introduced Wien's Law and the Stefan-Boltzmann Law. Showed how to use Wien's Law to get the wavelength of maximum emission. Used the Stefan-Boltzmann Law to show how the Intensity vs Wavelength curve various with temperature. At higher temperatures the wavelength of maximum emission shifts towards shorter wavelengths but an object at higher temperature emits more radiation at all wavelengths.
Discussed colors of stars and showed the Intensity (W/m^3) vs wavelength curves for various temperature stars.
Calculated the wavelength of maximum emission for a human. Showed how to calculate the power radiated by a human assuming emissivity = 1.
Talked briefly about the concept of a black body which is an object that absorbs at all wavelengths and emits at all wavelengths. Stars can be approximated as black bodies.
Heat Capacity Lab due tomorrow.
Monday, February 25, 2008
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
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
Friday, February 22, 2008
Thursday, February 21, 2008
Thursday, Feb 21, 2008
Showed Jearl Walker video on Leidenfrost effect.
Went over RA 14.2, RA 14.3.
Handed out lab sheet and assessment sheet for Heat Capacity Lab which students will do tomorrow (Friday).
Showed Hewitt video on Temperature, Heat and Expansion up to freezing pond.
Students have WebAssign problems chapter 14 to work on - due tomorrow.
Went over RA 14.2, RA 14.3.
Handed out lab sheet and assessment sheet for Heat Capacity Lab which students will do tomorrow (Friday).
Showed Hewitt video on Temperature, Heat and Expansion up to freezing pond.
Students have WebAssign problems chapter 14 to work on - due tomorrow.
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