The large turnbuckle supports a cable tension of 28.0 kN . The screws have a mean diameter of 30 mm and have square threads with a lead of 3.5 mm. The coefficient of friction for the greased threads does not exceed 0.25. Determine the moment M is applied to the body of the turnbuckle to tighten it. Both screws have single threads and are prevented from turning. Give your answer in Nm.