The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets.
B) it seemed messy and unsatisfying.
C) they came to believe that Earth should be at the center of things.
D) they came to believe that the sun should be at the center of things.
E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.
A
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Estimate the rate at which heat needs to be supplied to an astronaut repairing the Hubble telescope in space. Assume that the emissivity of the spacesuit is 0.5. Describe your model with a simple sketch and clearly state your assumptions.
GIVEN
• An astronaut repairing the Hubble telescope in space.
• Emissivity of spacesuit (?) = 0.5
FIND
• Rate at which heat needs to be supplied to the astronaut.
ASSUMPTIONS
• The spacesuit is idealized as a cylindrical object of height 1.8 m and diameter of 0.4 m.
• Temperature of 370C is maintained inside the suit.
SKETCH
Light of 10 cm wavelength is classified as what type of radiation?
A. 
ray
B. x-ray
C. UV
D. microwave
E. visible
Rub electrons from your hair with a comb and the comb becomes
A) negatively charged. B) positively charged. C) discharged.
What quantities are plotted on a blackbody radiation curve?
a. total radiated energy vs. temperature b. radiation intensity vs. wavelength c. wavelength of peak emission vs. temperature d. none of the above