The resistivity of most common metals
A)
remains constant over wide temperature ranges.
B)
increases as the temperature increases.
C)
decreases as the temperature increases.
D)
varies randomly as the temperature increases.
B
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Continued use of the fuels most relied upon in developing countries will eventually lead to ________
a. depletion of soil nutrients b. severe thermal pollution of water c. increased oil prices d. depletion of coal reserves in those countries
A spinning wheel has an angular momentum that points toward the east. If an eastward force is applied to the edge of the wheel,
A. the angular momentum of the wheel will not change. B. the angular momentum will get larger. C. the angular momentum of the wheel will change direction but not magnitude. D. the angular momentum will get smaller.
The visual pink glow of the Great Nebula in Orion
a. is a Herbig-Haro object. b. is a reflection nebula of dust. c. is an emission nebula of thin gas. d. contains only young low mass stars. e. is believed to be about 5 billion years old.
What is Eris?
A) an icy object that orbits in the Kuiper belt and is more massive than Pluto B) the largest known asteroid C) a moon of Pluto D) an extrasolar planet ejected by another solar system and captured by ours