Control rods are used in nuclear reactors
A. to produce more neutrons
B. to add more fuel
C. to produce more protons
D. to absorb neutrons
D. to absorb neutrons
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Ideal metals form close-packed crystal structures because the positive ______________cores pack like spherical billiard balls.
Fill in the blank(s) with the appropriate word(s).
The y-component of a force vector is -15.0N, while its magnitude is 27.2N. Which could be the vector’s direction?
A. 
below the +x axis
B. 
below the -x axis
C. 
below the -x axis
D. 
below the +x axis
E. None of the choices are correct.
The inability to observe parallax of stars contributed to the ancient Greek astronomers' rejection of the idea that Earth revolves around the Sun.
Answer the following statement true (T) or false (F)
A high tide is occurring at Charleston, South Carolina (80°W, 33°N). At approximately what other longitude is a high tide occurring?