How is it that the world's nations were able to forge the Montreal Protocol to reduce production of CFCs, when previously many nations had disregarded scientists' warnings?
What will be an ideal response?
The weight of evidence—and the gravity of the consequences—became too clear
to ignore. The known alternate hypotheses were shown to be incorrect. This is, of course,
not one hundred percent conclusive because there may have been an alternative model that
people were unable to conceive of. However, the danger of continued emissions was too
great to ignore, and the cost would be borne by everyone on Earth, not just some. As a
result, every national interest coincided, and concerted action became possible.
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A quantity that is a measure of how the distance traveled changes with time is
A. acceleration. B. velocity. C. force. D. speed. E. momentum.
The speed of sound varies with
A) loudness. B) frequency. C) wavelength. D) all of the above E) none of the above
The traditional theory states that the galaxy formed
a. as a large spherical cloud of gas that was rotating very slowly. b. from a large cloud of material that broke off a larger galaxy. c. from material that had been ejected in the violent explosion of a dying galaxy. d. as a result of mergers between several smaller groups of gas, dust, and stars. e. as two massive galaxies collided.
When a 60-Hz voltage is applied to a 22-?F capacitor, the capacitive reactance is
A) 121 ?. B) 760 ?. C) 13 × 10-4 ?. D) 510 ?. E) 83 × 10-4 ?.