Week 4 (Sept. 5).
Ch. 3 9,13, 16, 20, 23, + your cyop prob. Due Wed. Jan. 21
ch. 4 6,7,9, 16, 18, 32, 36, plus your problem --- (last time I am reminding of CYOP---it is on every HW) Due Wed. Jan. 28th
Ch. 5 7, 11, 16, 21, 30 + I won't say. ---and Due Feb. 4
Exam 1 Friday Feb. 6 Exam comments posted on Week 3.
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If you have "-1" on Ch. 3 ---23---then you either did not sufficiently attempt the problem, AND OR---did not read my Teams Discussion forum comment on Ch. 3.23. This tells me the problem is pervaisive AND the class is not discussing the problems with each other (or me)sufficiently. I strongly recommend that the class have a (several) study Modern PHYS group times where everyone attends (--not a bad idea if we get a time that I can make routinely). I'll answer questions, but you need to ask them.
Weather related issues "For no particular reason" --it seems that AU Campus is closed Monday. Due to this weather event, I'll accept Ch. 4 homework 1 day late (by noon Thursday) without penalty---though you can hand it in ontime if you like.
There ought to be questions about question 4.32
Ch. 6 hw--Due TBA
3,6, 9, 13, 17, and...do the "Colbert problem below"
Given the temperature of the universe is 2.7K (microwave background from big
bang).
a) What is the Intensity (power per area--but relates to energy density) of light put out by the universe as a
large blackbody
b) Further given that I(total)=c/4*(Energy density), determine
the photonic energy density just due to the background emission?
c) Now use the radius of the universe as 13
billion LY to determine the total energy due to the background light, and
determine the corresponding mass equivalent.
Coming soon, ----you shall be dumped out of your starship, inside a spherical shell (or horse shaped), blenderized (stirred--not shaken), and then asked to determine dT/dt initially. Radiative heat loss matters!