Three dimensions. three point particles are fixed in place in an xyz coordinate system particle a, at the origin, has mass ma. go particle b, at xyz coordinates (2.00d, 1.00d, 2.00d), has mass 2.00ma and particle c, at coordinates (-1.00d, 2.00d, -3.00d), has mass 3.00ma. a fourth particle d, with mass 4.00ma, is to be placed near the other particles. in terms of distance d, at what (a) x, (b) y, and (c) z coordinate should d be placed so that the net gravitational force on a from b, c, and d is zero?