A diver who weighs 500 N steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of
A) 10 J.
B) 500 J.
C) 510 J.
D) 5000 J.
E) more than 5000 J.
D
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A dog and a horse run along a pasture with the same kinetic energy. The faster runner is the
A. dog. B. horse. C. both run at the same speed. D. not enough information
Why is it better to recycle metals than to mine more?
A. Ores contain toxic elements. B. It takes far less energy to recycle. C. Mining is less expensive than recycling but not environmentally friendly. D. all of the above E. none of the above
Countries with a high rate of natural population increase will also have a _____
Fill in the blank(s) with the appropriate word(s)
Which of the following is incorrect regarding the spatial-temporal variability of net primary productivity?
A) Nutrient levels in oceans affect productivity. B) Productivity rates in deserts is much less than that of tropical regions. C) At temperate and high latitudes, the rate of carbon fixing is seasonally variable. D) Net primary productivity is highest in the winter in the midlatitudes and high latitudes. E) Productivity rates are constantly high throughout the year in the tropics.