A straight rod of negligible mass is mounted on a frictionless pivot and masses 2.5 kg and 1 kg are suspended at 40 cm and 100 cm respectively from the pivot (Figure 5.129). The rod is held at an angle $θ$ with the horizontal and released.

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Torques: 2.5 × 40 = 100 and 1 × 100 = 100 (kg cm). They balance at every angle, so the rod stays where it is.

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