Suppose you are standing due east of a car traveling southwest. What is the direction of the car’s angular momentum around you? Choose from the possible directions below (as seen by a person hovering over you), where A is north, C is east, and so on. If you are using the letters on the book’s back cover, you can indicate a double letter by pointing to the letter with two fingers. 
A. A
B. B
C. C
D. D
E. Upward
F. Downward
T. (The vector is zero)
E. Upward
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(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter? (b) What type of EM wave is this?
Answer the following statement(s) true (T) or false (F)
We can completely determine a q-vector’s components from an appropriate set of probability measurements
Nellie whirls a tether ball in a horizontal circular path over her head. If the action force is Nellie pulling on the string, the reaction force is
A) Nellie pulling on the string. B) the string pulling on Nellie. C) the ball pulling on the string. D) none of the above
A hypothetical PV solar cell in space can utilize solar radiation between 0.8 and 1.1 ?m in wavelength. Estimate the maximum theoretical efficiency for this solar cell facing the sun using the ideal blackbody curve of the sun as the source. Supposing that all the radiation outside the spectral range utilized by the solar cell for generating electricity is dissipated into heat, estimate the rate at which a module of solar cells of 1.0 m2 area would have to be cooled to maintain the temperature of the module below 90°F.
GIVEN • PV solar cell utilizing radiation between 0.8 and 1.1 ?m. • Surface area of solar cells (A)= 1.0 m2 FIND • Maximum theoretical efficiency of solar cell facing the sun using ideal blackbody curve of the sun. • Rate at which module of solar cells would have to be cooled to maintain temperature of module below 900F or 320C. ASSUMPTIONS • The sun’s radiation can be assumed as ideal black body curve. • The variation in irradiation is linear for the interval of 0.8 to 1.1 ?m.