A pulley system is capable of
A. multiplying a force.
B. changing the direction of a force.
C. both of these
D. none of the above
Answer: C
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What river has been a major supplier of commercial energy for decades in the region of southern Africa
A) Nile B) Niger C) Congo D) Limpopo E) Zambezi
Elevation affects the distribution of terrestrial biomes through its effect on
A) temperature. B) precipitation. C) both temperature and precipitation. D) neither temperature nor precipitation.
The increasing rate of population growth over the past 50 years is the result of:
a. increasing birth rates in the developed countries b. increasing birth rates in the developing countries c. decreasing mortality rates in the less developed countries d. increasing mortality rates in the less developed countries
The term molecular weight is strictly correct for which of the following?
A) ionic compounds B) covalent compounds C) both a and b D) neither a nor b