A condition that causes a system to change dramatically is a ____
a. feedback
b. threshold
c. model
d. subsystem
B
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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.
Which exotic animal, introduced in Australia, reached plague proportions, and was finally brought under control only after the purposeful introduction of a disease that affected only this particular introduced species?
A) rabbits B) camels C) wallabies D) goats E) dogs
A wave travels an average distance of 6 m in 1 s. What is the wave's velocity?
A) less than 0.2 m/s B) 1 m/s C) 3 m/s D) 6 m/s E) more than 6 m/s
What are the three economically strongest countries in Latin America, accounting for 80% of the region's manufacturing output?
a. Cuba, Venezuela, and Mexico b. Brazil, Argentina, and Mexico c. Brazil, Chile, Panama d. Brazil, Mexico, Honduras e. Mexico, Guatemala, Ecuador