A force of 100 N and one of 150 N act horizontally on a block. The net force is
A. definitely 250 N.
B. definitely 50 N.
C. either 50 N or 250 N.
D. between 0 N and 250 N.
Answer: C
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Using the map of U.S. topography (Figure 5), locate and label the major mountain ranges of the United States (Rocky Mountains; Appalachians; Alleghenies; Catskills; Sierras; Cascades; and Ozarks). What will be an ideal response?
The Intergovernmental Panel on Climate Change ________
A) constructed the Kyoto Protocol B) performed the research included in the climate change findings C) fines companies that pollute D) could not achieve its objectives because of lack of popular support E) is an international panel that reports on how climate change influences biomes and economies
In the United States, there was great concern in the early 1980s when earthquakes were frequent, including harmonic tremor, and four magnitude 6 earthquakes caused damage near ________.
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The thinning of the ozone layer over the Antarctic always occurs at the end of the Antarctic winter because
A. ozone is consumed by melting ice as winter transitions to summer. B. the Antarctic experiences its highest level of radiation during its winter. C. during their winter, residents of the southern hemisphere use more CFCs. D. UV from the sun is necessary to the creation of ozone from oxygen and the Antarctic receives no UV from the sun during its winter.