What temperature exists inside a solar collector (effective collection area of 15 m2 ) on a bright sunny day when the outside temperature is +20°C?
Assume that the collector is thermally insulated, that the Sun radiates the collector with a power per unit area of 600 W/m2, and that the collector acts as a perfect blackbody.
A)
73°C
B)
81°C
C)
93°C
D)
107°C
E)
154°C
C
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Indicate whether the statement is true or false
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a. 4 750 kg b. 7 460 kg c. 1 760 kg d. 1 660 kg e. 4 560 kg
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a. prominences b. coronal holes c. spicules d. granulation e. auroras
Consider a two-component complex vector 
where a and b are real numbers. Which of the following vectors are orthogonal to this vector?
A. 
B. 
C. 
D. 
E. 
F.C and D
T. None of the above.