The date that the Sun "sets" at the North Pole is:
A) September 22. B) December 21. C) March 21. D) June 21.
A
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According to the parallelogram rule for vectors, the diagonal of the parallelogram represents
A. the vector sum of the forces. B. the resultant of the vectors. C. either component of the vectors. D. all of the above
What statement is true of the surface area of oceanic ridges and their associated features?
A) They consist of slightly less area than that of all the land above sea level. B) They consist of more area than that of all land above sea level. C) These are almost always located in the mid-ocean. D) These areas are largely covered by sediments.
Which of the following has the lowest boiling point?
A) butane B) 1-propanamine C) 1-propanol D) 2-propanamine
Four companies, Alpha, Beta, Gamma and Delta, are burning coal to produce electricity. As a result, they also produce emissions. In the table below, the first row of shows the total pounds of emissions currently produced by each firm. The other rows of the table show the cost for each firm of reducing emissions by the first 50 tons, the second 50 tons, and so on. The total cost of requiring each firm to reduce its garbage by one third is
A. $167 B. $137 C. $187 D. $127