1-1. Determine the resultant internal normal force acting on the cross section through point A in each column. In (a), segment BC weighs 180 lb/ft and segment CD weighs 250 lb/ft. In (b), the column has a mass of 200 kg/m. |5 kip 18 kN B 200 mm 200 mm 6 kNI 6 kN 10 ft 8 in. 3 m 8 in. 200 mm 200 mm 3 kip 3 kip 4.5 kN 14.5 kN 4 ft A 4 ft I m D (а) (b)

The structure is comprised of rigid bars AB and BCD supported by hinges at A and D. A steel rod at C provides additional support to the system. As shown, there is a roller connection between the bars at B. Determine the magnitude of the force P applied as shown if the vertical displacement of point B is limited to 1.5 mm. Neglect the weights of the bars.

2. The steel pipe has a length of L=24 in. If it is fixed at section C and subjected to the horizontal 200-lb force acting on the handle of the pipe wrench at its end, determine the internal loadings at the section A. 10 in. 14 in 200 lb

F=150lb a=6in bd=8in