If positive electric charges of Q and q coulombs are situated at positions 
and 
, respectively, then the force of repulsion they experience is given by
?
?
where 
, F is given in newtons, and all positions are measured in meters. Assume that a charge of 6 coulombs is situated at the origin and that a second charge of 12 coulombs is situated 
and moving in the y direction at 1.5 meters per second. How fast is the electrostatic force it experiences decreasing?
?
Round your answer to the nearest trillion.
?
A. 
B. 
C. 
D. 
E. 
Answer: C
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= 
+ 38
A. x ? 0; {4}
B. x ? 0; 
C. No restrictions; {2}
D. x ? 0, 2; 
Match the point in polar coordinates with either A, B, C, or D on the graph.
A. A B. B C. C D. D
Solve. Write the fraction in simplest form.There are 14,400 runners at a marathon. If 12,000 are male, what fraction of the runners are female?
A. 
B. 
C. 
D. 
Find the indicated roots.Fifth roots of 1; trigonometric form
A. 1, cos 72° + i sin 72°, cos 144° + i sin 144°, cos 216° + i sin 216°, cos 288° + i sin 288° B. -1, cos 36° + i sin 36°, cos 108° + i sin 108°, cos 252° + i sin 252°, cos 324° + i sin 324° C. 1, cos 36° + i sin 36°, cos 108° + i sin 108°, cos 252° + i sin 252°, cos 324° + i sin 324° D. -1, cos 72° + i sin 72°, cos 144° + i sin 144°, cos 216° + i sin 216°, cos 288° + i sin 288°