A person is attracted toward the center of Earth by a 500-N gravitational force. The force of attraction of Earth toward the person is
A) very, very small.
B) very, very large.
C) 500 N.
C
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Why is biosynthesis unlikely to occur today as it did in Earth's youth?
a. Living organisms have altered oceanic and atmospheric conditions b. There is less available oxygen in the atmosphere c. Ozone is less protective from the sun's influence d. The ocean’s do not contain enough free iron
Two cities are located at the same latitude (40 degrees). City A is in the Southern Hemisphere and City B is in the Northern Hemisphere. Assume the two cities reflect the general characteristics of the hemispheres where they are located
Which city should have the warmer winter temperatures? A) City A B) City B C) Both cities should have nearly identical winter temperatures.
Which of the following is obtained by oxidizing hexanal?
A) hexanol B) 2-hexanone C) hexanoic acid D) none of these
Use the map to answer this question.
Which pair of air masses will contain the coldest air?
A. A and C B. B and C C. B and D D. C and D