The equilibrium position of the mass m occurs where y = 0 and y_B = 0. When the attachment B is given a steady vertical motion y_B = b sin wt, the mass m will acquire a steady vertical oscillation. Derive the differential equation of motion for m and specify the circular frequency w_c for which the oscillations of m tend to become excessively large. The stiffness of the spring is k, and the mass and friction of the pulley are negligible.

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ot YB 9/ B Equilibrium position m