The sliding block is given a horizontal acceleration to the right that is slowly increased to a steady value a. The attached pendulum of mass m and mass center G assumes a steady angular deflection θ. The torsion spring at O exerts a moment M = k_Tθ on the pendulum to oppose the angular deflection. Determine the torsional stiffness k_T that will allow a steady deflection θ.

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kT a 300 mm G