12.33. Model: The object balanced on the pivot is a rigid body. Visualize:Since the object is balanced on the pivot, it is in both translational equilibrium and rotational equilibrium. Solve:There are three forces acting on the object: the gravitational force ( )G1FGacting through the center of mass of the long rod, the gravitational force ( )G2FGacting through the center of mass of the short rod, and the normal force PGon the object applied by the pivot. The translational equilibrium equation
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