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Physics (Gravitation)

In Fig. 13-25, three particles are fixed in place. The mass of B is greater than the mass of C. Can a fourth particle (particle D) be placed somewhere so that the net gravitational force on particle A from particles B, C, and D is zero? If so, in which quadrant should it be placed and which axis should it be near?

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Answers:
A) There is no place to put D to make this possible.
B) Yes; put D in the quadrant with x > 0 and y > 0, closer to the x axis.
C) Yes; put D in the quadrant with x > 0 and y > 0, closer to the y axis.
D) Yes; put D in the quadrant with x > 0 and y < 0, closer to the x axis.
E) Yes; put D in the quadrant with x > 0 and y < 0, closer to the y axis.
F) Yes; put D in the quadrant with x < 0 and y < 0, closer to the x axis.
G) Yes; put D in the quadrant with x < 0 and y < 0, closer to the y axis.
H) Yes; put D in the quadrant with x < 0 and y > 0, closer to the x axis.
I) Yes; put D in the quadrant with x < 0 and y > 0, closer to the y axis.

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