A decorative piece consists of a 20cm long uniform brass rod weighing 4N and two ornaments, one weighing 6N and one weighing 10N, fixed to the ends. At what point should a supporting chain be attached so that the ornament balances?

Answer 1

At the center of mass (CM).

Measuring distance from the 6N ornament end,
4*10 + 10*20 = 20 X
X = 12 cm is the CM location