A rolling freight car collides with an identical freight car at rest. After coupling they roll with a speed of 2 m/s. From this information the initial speed of the lighter freight car was

A. 4 m/s.
B. 8 m/s.
C. 6 m/s.
D. 5 m/s.


Answer: A

Environmental & Atmospheric Sciences

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African river blindness is caused by a roundworm carried by biting black flies. When bitten by a fly, larval worms are passed through the wound. Inside a human body, the parasites cause skin problems and eventually blindness. Which type of species interaction is represented here?

A. parasitism B. predator-prey C. commensalism D. resource partitioning

Environmental & Atmospheric Sciences

Weathering is the transportation or removal of broken-down materials

Indicate whether this statement is true or false.

Environmental & Atmospheric Sciences

World-systems theorists such as Wallerstein argue that an artificial division of labor has made earning a good income from free trade difficult for most

A) countries and corporations. B) transnational corporations (TNCs). C) multinational corporations (MNCs). D) more developed countries (MDCs). E) less developed countries (LDCs).

Environmental & Atmospheric Sciences

Which of the following is meant by “double politics”?

a. Grassroots organizing and top-down authority b. Collective and individual action c. Conflict and consensus d. Conceptions and connections

Environmental & Atmospheric Sciences