Readings for this week and next:
     Tues. 9/22/09      MH&C Ch.  5.1-5.4            Heat transport (advection, conduction...)
     Thurs. 9/24/09    MH&C Ch.  5.5, 7.1-7.4     Radiation reaching Earth (Milankovich Cycles)

     Tues. 9/29/09     MH&C Ch.  7.5-7.7            Greenhouse effect & radiation balanance
     Thurs. 10/1/09     --------------------------            Test 1 in class in SW220

Homework 4: Due next Tuesday, September 29
     Chapter 5: E5.2, P5.5, P5.9, and special problem 1 below.
     Chapter 7: E7.4, P7.6, P7.9, P7.10

     Special Problem 1: Example 5.3 in Chapter 5 of McFarland, Hunt, and Campbell, calculates a 32-watt heat flow through a 1m x 1m x 3 mm single pane window when the temperature difference across the window is 20 degrees Celcius.
a.) How much energy does this house lose through 10 such windows in one 24 hour day, assuming the temperature difference stays at 20 degrees C?
b.) Indianapolis has 5699 degree days in an annual heating season. Calculate the total loss of energy through its windows in a year if our 10 window house is in Indianapolis.
c.) If this house were heated by electric baseboard heating (Heaven forbid...) and as electricity in Indianapolis costs $0.10/kWh, how much does it cost for the heat lost through the windows in a year?
d.) A new owner of the house decides to replace the old single pane windows with new thermopane windows, with two layers of glass, each 1m x 1m x 3mm, separated by a centimeter (0.01m) of nonconvecting Argon (see table 5-1). The expected heat flow through each of the new windows is now reduced from 32 watts to how much?

News and Events:
1.) Physics Colloquium - Wednesday, September 23, 4:00 pm, SW119, Simon Billinge, Columbia, "Material structure in the nano-world: The nanostructure problem and other efforts at solving it"
2.)  Geology Colloquium - Monday, September 28, 4:00 pm, Geology G143, Phil Stevens, SPEA IU, Oh where, oh where is OH? Measuring the elusive hydroxyl radical in the atmosphere.
3.) Geography Colloquium: Friday, September 25, Student Building 150, Richard Phillips, IU Biology, "The Carbon We Do Not See: How root-derived carbon may sustain forest productivity under elevated CO2"