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Derive the equations of motion for the pendulum supported by a linear spring of constant kand unstretched length ru. Neglect friction at the pivot

Derive the equations of motion for the pendulum supported by a linear spring of constant kand unstretched length ru. Neglect friction at the pivot O, the mass of the spring, and air resistance. Treat the pendulum bob as a particle of mass m and use polar coordinates. Figure P3.50 www.

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