All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A) changes in the Earth's axis tilt
B) changes in the Earth's overall reflectivity
C) a gradual rise in the atmospheric content of oxygen
D) changes in the atmospheric concentration of greenhouse gases
C
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The flight of a blimp best illustrates
A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.
If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?
A) empty space-a pure vacuum B) rarefied clouds of atomic hydrogen C) star clusters D) hot bubbles of ionized hydrogen E) cool, dense clouds of molecular hydrogen
Tritium is radioactive with a half-life of 12.33 years decaying into 3He with low-energy electron emission. If we have a sample of 1.91 × 10^18 tritium atoms, what is its activity in decays/second? (1 year = 3.15 × 10^7 s)
a. 4.92E+9 decays/second b. 3.41E+9 decays/second c. 1.07E+17 decays/second d. 6.69E+16 decays/second e. 3.41E+10 decays/second
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is her angular displacement (in rad) in the first 12 minutes?
a.
0
b.
2?
c.
4?
d.
16?
e.
32?