What gas is the primary constituent of our atmosphere?
A) oxygen
B) carbon dioxide
C) nitrogen
D) hydrogen
E) helium
C
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Work is done
A. By the component of the force parallel to the displacement B. Only if the entire force is parallel to the displacement C. By the component of the force perpendicular to the displacement D. By all forces
Find the equation 
that fits the following data.
t(sec) 0 1 2 3 4 5
x(m) -16 -12 0 20 48 84
A. 
B. 
C. 
D. 
As water changes to ice, water molecules
A) absorb energy. B) release energy. C) retain their energy. D) lose the quality of wetness.
A surprise from the Pioneer Venus photos was that:
A) the craters on Venus are all large. B) the clouds rotate around the planet in only four days, very unlike the slow surface rotation. C) the clouds of Venus are mainly water vapor, like our own. D) the highest volcano, Maxwell Mons, protrudes above the cloud deck. E) no impact craters at all are found on the Venusian surface.