The weight of air in a column 1-m2 in cross section that extends from sea level to the top of the atmosphere is
A) 101 N.
B) 10,100 N.
C) 101,000 N.
D) 101,000,000 N.
Answer: C
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The letter N is symmetric (in the sense defined in this chapter) for rotations around an axis going through its center that points in which of the following directions?
A. 
B. 
C. Perpendicular to the plane of the letter
D. A and C
E. A, B, and C