7-5 A piece of sheet metal, in the shape of an equilateral triangle, is pivoted at one vertex an

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7-5 A piece of sheet metal, in the shape of an equilateral triangle, is pivoted at one vertex and swings in the plane of the triangle. Why must the frequency of small oscillations be some numerical multiple of $(g/l)^{1/2}$, where $l$ is the length of a side? Determine the numerical factor.