Two electric charges QA = + 1.0 ?C and QB= - 2.0 ?C are located 0.50 m apart. How much work is needed to move the charges apart and double the distance between them?
A)
-36 × 10-3J
B)
+18 × 10-3
C)
0
D)
+36 × 10-3
E)
-18 × 10-3
B
You might also like to view...
A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be
A) less. B) the same. C) more.
One kilowatt is a unit of
A) energy. B) power. C) voltage. D) current. E) resistance.
A 2.00-kg object moves with constant velocity 3.00 m/s toward the east. Two forces act on the object. The first is a 40.0 N force toward the west. What is the second force that acts on the object?
A) 23.0 N east B) 40.0 N east C) 26.7 N east D) 46.0 N east E) 46.0 N west
A shaving mirror and a make-up mirror both magnify the image. Thus, these mirrors are ________ mirrors.
A. concave B. plane C. convex