A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
A) the law of gravity.
B) Newton's third law.
C) conservation of momentum.
D) conservation of angular momentum.
E) conservation of energy.
D
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What is the most important role that the carbon dioxide cycle plays in the regulation of the Earth's climate?
A) it removes carbon dioxide from the atmosphere produced by respiration B) it regulates the surface temperature by varying the amount of carbon dioxide in the atmosphere C) it provides carbonate minerals in the oceans for aquatic life forms D) it provides carbon dioxide in the atmosphere for photosynthesis
Melting and freezing are
A) changes of phase. B) opposite processes. C) both of these D) neither of these
A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?
a. 0.064 kg•m2 c. 0.075 kg•m2 b. 0.096 kg•m2 d. 0.16 kg•m2
If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) nothing B) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy. C) The Sun would not be disturbed, but the solar system would be ripped apart. D) The Sun would die, causing Earth to die as well.