A mobile consists of a light horizontal rod pivoted at its center

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A mobile consists of a light horizontal rod pivoted at its center. On the left side, a 0.25 kg0.25\,\text{kg} figurine hangs 0.25 m0.25\,\text{m} from the pivot. On the right side, an identical figurine originally hung the same distance from the pivot, but it has been replaced by a 0.30 kg0.30\,\text{kg} figurine at the same location, causing the mobile to tilt. Which of the following single adjustments will most effectively restore rotational equilibrium? (a) Move the 0.30 kg0.30\,\text{kg} figurine 0.05 m0.05\,\text{m} closer to the pivot. (b) Move the 0.30 kg0.30\,\text{kg} figurine 0.05 m0.05\,\text{m} farther from the pivot. (c) Move the 0.25 kg0.25\,\text{kg} figurine 0.05 m0.05\,\text{m} farther from the pivot. (d) Move the 0.25 kg0.25\,\text{kg} figurine 0.05 m0.05\,\text{m} closer to the pivot.

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