The cylinder is confined by the brake, where s = 0.4. Determine the required compression in

The cylinder is confined by the brake, where μ_s = 0.4. Determine the required compression in the spring in order to resist a torque of 800 N · m on the cylinder. The spring has a stiffness of k = 3 MN/m and an unstretched length of 60 mm. End C of member ABC slides freely along the smooth vertical guide.

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B 400 mm A, M 200 mm C -250 mm