When a metal ring with a gap in the shape of the letter C is cooled, the gap becomes
A) wider.
B) narrower.
C) remains the same size.
Answer: B
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Nuclear Reactions: Determine the missing product X in the nuclear reaction 
U + 
n ? X + 2?-.
Fill in the blank(s) with the appropriate word(s).
Why does Titan have such a nitrogen-rich atmosphere?
A) It was formed that way in the solar nebula. B) The nitrogen comes from the breakup of ammonia (NH3 ) by solar radiation and subsequent thermal escape of the hydrogen. C) The nitrogen was formed from the chemical reaction of sulphuric acid with surface rocks. D) Through the impact of nitrogen rich comets during the early solar system. E) The nitrogen was created through a chain of fusion reactions in Titan's core.
Our local group is situated
A) within a major supercluster. B) directly between two major superclusters. C) relatively distant from any supercluster.
Essentially, the first law of thermodynamics says that:
a. one form of energy cannot be converted into another b. entropy is increasing in the universe c. energy can be neither created nor destroyed d. energy cannot be converted into matter or matter into energy e. energy is the capacity to do work