Approximately how many people in the U.S. die as result of emissions from coal-burning power plants (and other sources) each year?
A. 24,000
B. 12,000
C. 2000
D. 1000
Answer: A
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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.
Oneway to study nature is to develop a(n) ____, which is an approximate physical or mathematical simulation of a system.
A. theory B. laboratory C. experimental group D. model E. law
Eluviation occurs due to ____
a. hygroscopic water b. gravitational water c. capillary water d. soil air e. humus
A heavy block is suspended at rest by a vertical rope. When you raise the block at a constant velocity, the rope tension
A. is zero. B. is greater than its weight. C. is less than its weight. D. equals its weight.