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4. problem 4. The mass m is hanging from a cord attached to the circular homogeneous disc of mass M and radius R ft, and is supported by a damper with damping constant c. Excitation force Focos(ot) applies to the block. The disc is restrained from rotation by a spring attached at radius r ft from the center. If the mass is displaced downward from the rest position, determine equation of motion, natural frequency and steady-state response for small vibration with respect to 0 Ww
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