### Determine the mass of the disk

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A uniform disk of radius r = 120 mm is welded at its center to two elastic rods of equal length with fixed ends at A and B. Knowing that the disk rotates through an 8° angle when a 500-mN . m couple is applied to the disk and that it oscillates with a period of 1.3 s when the couple is removed, determine

(a) the mass of the disk,

(b) the period of vibration if one of the rods is removed.

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