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Equilibrium and center of mass

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In Fig. 13-11, a horizontal scaffold, of length 2.00 m and uniform mass 50 kg, is suspended from a building by two cables. It has dozens of paint cans stacked on it at various points. The total mass of the paint cans is 77.0 kg. The tension in the cable at the right is 735 N. How far horizontally from that cable is the center of mass of the system of paint cans?

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