The sliding block is given a horizontal acceleration to the right that is slowly increas...

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_T^Θ on the pendulum to oppose the angular deflection. Determine the torsional stiffness k_T that will allow a steady deflection Θ.