One method of mining coal, applied in Tennessee, Kentucky, and West Virginia, is called "mountaintop mining." What possible consequences of such mining can you propose? Explain
What will be an ideal response?
There are both positives and negatives. On the positive side, mountaintopping
creates newly flat land in a region with many mountains. The flat land can be sold to
businesses, bringing jobs to the poorer regions of these states. This can increase the local
tax base and allow expansion of government services.
On the negative side are water degradation, permanent pollution of streams by materials
brought to the surface, and other hazards. Wildlife and fish can be adversely affected. The
quality of life for residents can plunge.
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If a star with an absolute magnitude of x 5 has an apparent magnitude of +5, then its distance is
a. 1 pc. b. 10 pc. c. 100 pc. d. 1000 pc. e. 10,000 pc.
A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
A) Its acceleration is constantly decreasing. B) Its acceleration is constant. C) Its acceleration is constantly increasing. D) Its acceleration is zero. E) Its acceleration is greater than g.
A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's original kinetic energy is retained by the neutron?
a. 14.4% c. 41.4% b. 28.4% d. 71.6%
What is the purpose of adding aluminum salts and a base to water during water treatment?
A) The two together gel and trap dirt and bacteria. B) The higher pH kills bacteria. C) The aluminum removes the rust taste from the water. D) The base dissolves the dirt. E) It improves the taste.