A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is
A) 300 N downward.
B) 500 N downward.
C) 800 N downward.
D) 300 N upward.
E) 500 N upward.
D
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Mali is a former French colony in West Africa. It has been independent since 1960 but remains heavily dependent upon France for financial assistance, and often has to yield to French geopolitical decisions to get aid from France. Mali suffers from a textbook case of
A) revolution B) insurgency C) decolonialization D) neocolonialism E) geopolitics
Which of the following factors control the nature of volcanic eruption?
a) Amount of dissolved gas in the magma b) Temperature of the magma c) Silica content of the magma d) All of these e) Only (a) and (b)
On a worldwide basis ________ provides the largest percentage of renewable energy.
A. wind B. hydroelectricity C. biomass D. solar
The "channeled scablands" of the state of Washington were caused by ________.
A. the failure of an ice dam during glacial melting B. a large rainstorm C. the avulsion of a major river channel D. winds from an ancient volcanic explosion at Mt. St. Helens E. the gentle, slow melting of glaciers