In a certain piece of modern sculpture, four iron spheres are connected in a line by…

In a certain piece of modern sculpture, four iron spheres are
connected in a line by lightweight rods. The separation between
each sphere’s geometric center and the next along the line is 50
cm. The spheres decrease in size along the line; their masses are
44kg, 22 kg, 11 kg and 5.5 kg respectively; and their diameters are
22 cm, 17 cm, 14 cm, and 11 cm respectively. The artist wants to
suspend this system of spheres by a single wire so that it rotates
ponderously in the breeze above the viewers’ heads. We will see in
unit N that the appropriate place to attach the wire is at the
system’s center of mass. Where is this point (relative to the
center of the most massive sphere)?

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