You can use a simple technique to find the center of gravity of an irregular shape. Figure Q7. 10 shows a cardboard cutout of the outline of the continental United States. The map is suspended from pivot I and allowed to hang freely; then a blue vertical li ne is drawn. The map is then suspended from pivot 2, hangs freely, and the red vertical line is drawn. The center of gravity lies at the intersection of the two lines. Explain how this technique works.

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Pivot I FIGURE Q7.10 Pivot 2 cation