A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16%
b. 7%
c. 23%
d. 4%
e. 32%
A
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The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.
Without the protection of the Earth's magnetic field, most of the atmosphere would by now have
A) been lost into space B) frozen onto the surface C) dissolved in the oceans D) been destroyed by chemical reactions
As originally stated, the Copernican model did no better job of predicting planetary behavior than did the Ptolemaic one
Indicate whether the statement is true or false
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Which statement is true about the unit vectors 
, 
and 
?
A.
B.
C.
D.
is directed east and is directed south, points up out of the surface.E.