### Find the period of small oscillations

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A 10-lb uniform rod CD of length l =2.2 ft is welded at C to two elastic rods, which have fixed ends at A and B and are known to have a combined torsional spring constant K = 18 lb · ft/rad. Determine the period of small oscillations, if the equilibrium position of CD is

(a) vertical as shown,

(b) horizontal.

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