What was the one most important event in the Precambrian?
What will be an ideal response?
Answer: The accumulation of free oxygen in the atmosphere. This allowed the ozone layer to form and allowed life to emerge.
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For silver at a tensile stress of 7 MPa and a temperature of 839°C, there are two equally contributing creep mechanisms. What are they?
What will be an ideal response?
A high-mass star dies more violently than a low-mass star because
A) it must always end up as a black hole. B) it generates more heat and its core eventually collapses very suddenly. C) it cannot fuse elements heavier than carbon. D) gravity is weakened by its high luminosity. E) it is most often found as part of a binary system.
?Instructions: On occasion, the notation 
will be a shorthand notation for 
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Exhibit 3-2
A child starts at one corner of a cubical jungle gym in a playground and climbs up to the diagonally opposite corner. The original corner is the coordinate origin, and the x, y and z axes are oriented along the jungle gym edges. The length of each side is 2 m.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 3-2. The child's displacement is:
A.
B.
C.
D.
E.
Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential from most positive to most negative when traveling from A to B
a.
I = II = III = IV.
b.
II = III > I > IV.
c.
III > I = IV > II.
d.
II > I = IV > III.
e.
I > II = III > IV.