A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x1 = 2.0 m and another point x2 = 5.0 m because of this charge?
A) - 11 × 103 V
B) 11 × 103 V
C) - 33 × 103 V
D) 33 × 103 V
E) 0 V
B
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Resistance and Resistivity: Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the diameter of the other. How do the resistances of these two wires compare?
A. The thicker wire has 1/3 the resistance of the thinner wire.
B. The thicker wire has 1/9 the resistance of the thinner wire.
C. The thicker wire has 3 times the resistance of the thinner wire.
D. The thicker wire has 9 times the resistance of the thinner wire.
E. The thicker wire has 
times the resistance of the thinner wire.
What affects long-term climate change?
a. changes in the Sun’s brightness b. changes in Earth’s reflectivity c. change in the tilt of Earth’s axis d. changes in greenhouse gas abundance e. all of the above
A 3rd magnitude star is 3 times brighter than a 1st magnitude star
a. True b. False Indicate whether the statement is true or false
Which of the following is not a derived quantity?
a. Volume b. Speed c. Mass d. Density