If a block D of negligible size and of mass m is attached at C, and the bell crank of mass M is given a small angular displacement of θ, the natural period of oscillation is τ1. When D is removed, the natural period of oscillation is τ2. Determine the bell crank’s radius of gyration about its center of mass, pin B, and the spring’s stiffness k. The spring is unstretched at θ = 0°, and the motion occurs in the horizontal plane.

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