If 
(where a is a constant) then 
A. 2x
B. 2ax - a/y2 + a
C. 2azx/y - azx2/y2 + ax2/y
D. 2azx/y
E. azx3/3y
F. something else (specify)
D. 2azx/y
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A submarine rests on the sea bottom. The normal force exerted upon the sub by the sea-floor is equal to
A) the buoyant force less 1 atmosphere acting on the sub. B) the weight of the sub plus the weight of the displaced water. C) the weight of the sub. D) the weight of the sub less the weight of the displaced water. E) the weight of the displaced water.
If the merger theory is correct, the brightest active galactic nuclei should:
A) be in the smallest elliptical galaxies. B) contain the youngest stars. C) contain the least mass. D) contain supermassive black holes. E) form small irregular galaxies.
The Orion region contains young main sequence stars and an emission nebula, but the original molecular cloud they formed out of has been dispersed
Indicate whether the statement is true or false
Energy and Momentum: If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum?
A. 
B. 2
C. 2
D. 4
E. 16