Which alternative energy source does NOT utilize direct solar energy?
a. power towers
b. parabolic troughs
c. dish/engine concentrator
d. vapor hydrothermal
e. photovoltaic
D
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The electric field strength between a pair of oppositely charged parallel plates is
A. composed of field lines curved in opposite directions. B. uniform. C. stronger at the ends. D. none of the above
Plants that are allelopathic
A) have very sharp spines instead of leaves. B) cannot tolerate long periods of drought. C) produce flowers very rapidly after a rain event. D) are likely to be located away from other plants.
How do differences in the degree of governmental control in China and India relate to their different birth control policies?
What will be an ideal response?
In the twenty-first century, the United States has witnessed
A) the wealthiest one percent of the population control less of the wealth since the 1970s. B) the wealthiest one percent of the population control more of the wealth since the 1970s. C) little change in how much wealth the wealthiest control. D) the flight of wealth by the top one percent to Asia. E) the elevated tax rates on the wealthiest Americans to ensure equality.