Charge of uniform density 12 nC/m is distributed along the x axis from x = 2.0 m to x = 5.0 m. What is the electric potential (relative to zero at infinity) at the origin (x = 0)?
a. 91 V
b. 99 V
c. 82 V
d. 74 V
e. 140 V
b
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Suppose that a bar magnet moves vertically upward toward the origin (point O), as shown below and left. 
In this situation, specify the directions of each of the vector quantities described below. Use the answer chart provided above and to the right (note that answers B and E refer to the +y and -y directions, respectively). What is the direction of 
at the origin (point O)?
A. A B. B C. C D. D E. E F. F T. Zero
Based on fundamental laws of motion and gravity, which of the following best explains why Kepler's second law (planets move faster in the parts of their orbit that are closer to the Sun and slower when they are farther from the Sun) is true?
A) A planet's angular momentum must be conserved as it moves around its orbit. B) The speed of a planet at any point in its orbit depends on its temperature, which varies with distance from the Sun. C) The strength of gravity is inversely proportional to the square of the distance between two objects. D) The gravitational influence of other planets determines the speed of any particular planet's orbit.
Which type of asteroid is classified to be dark as coal and probably carbonaceous?
a. C-type b. F-type c. M-type d. S-type e. V-type
What is the frequency of the wave?
A. 80 Hz
B. 50 Hz
C. 120 Hz
D. 140 Hz
E. 160 Hz