EXAMPLE 2 ■ The rigid beam BCD is attached by bolts to a control rod at B, to a hydraulic cylinder at C, and to a fixed support at D. The diameters of the bolts used are: dB = dp = 3/8 in., dc = 1/2 in. Each bolt acts in double shear and is made from a steel for which the ultimate shearing stress is t₁ = 40 ksi. The control rod AB has a diameter d₁ = 7/16 in. and is made of a steel for which the ultimate tensile stress is ou =60 ksi. If the minimum factor of safety is to be 3.0 for the entire unit, determine the largest upward force that may be applied by the hydraulic cylinder at C. B 6 in. S in. D