The symbols 
and 
are used to represent, respectively, the charge density per unit
A. length, volume, and area.
B. volume, length, and area.
C. area, volume, and length.
D. volume, area, and length.
E. area, length, and volume.
B. volume, length, and area.
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A column of contained air extends from sea level to the top of the atmosphere. The contained air has mass. If the column instead contained the same mass of water, its height would be
A) 1/13.6 times as high as the atmosphere. B) about 3/4 m high. C) 10.3 m high. D) about 5.6 km high.
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is
A) 0 m/s2. B) 5 m/s2. C) 10 m/s2. D) infinite. E) none of the above
Suppose you have two point charges of opposite sign. As you move them farther and farther apart, the potential energy of this system relative to infinity
A) increases. B) decreases. C) stays the same.
White light is sent through a prism, and the various colors are separated in typical fashion. Which of the following colors would have the highest index of refraction in this prism?
a. green c. blue b. red d. yellow