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An arc-shaped earring in the shape of a semicircle (radius = R) is hung on a wire according to the pattern. Determine the angle of

An arc-shaped earring in the shape of a semicircle (radius = R) is hung on a wire according to the pattern. Determine the angle of contact between the hanging wire and the jewelry (? / 2 )

Hint: The problem requires formulas for the center (or center of gravity) of the curve for line integrals; e.g. (correct answer is 122.5 degrees)

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