What types of fundamental particles are in an atom?
A) just up quarks and top quarks
B) just neutrons and electrons
C) just down quarks, electrons, and positrons
D) just up quarks, down quarks, and electrons
E) just electons and positrons
Ans: D) just up quarks, down quarks, and electrons
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The atom pair bond energy as a function of interatomic ______________is the interatomic pair potential.
Fill in the blank(s) with the appropriate word(s).
Pressure in a Liquid: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the absolute (total) pressure p on the bottom of this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
Why is the regolith light-colored in the highlands, while darker in the maria?
A. The highland regions receive more sunlight than the maria. B. The highland regolith is younger, and therefore lighter in color. C. Lunar regolith is the same color everywhere, but the maria reflect less light. D. The regolith in the maria has a different mineral composition.
The threshold energy to initiate a certain nuclear reaction is 3.16 MeV and the Q for the reaction is -2.37 MeV. The stationary target is how many times as massive as the incident particle?
What will be an ideal response?