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.

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5 kip 18 kN B 200 mm 200 mm 6 kN 16 kN 10 ft 3 m 8 in. 8 in. 200 mm 200 mm 3 kip 3 kip 4.5 kN 4.5 kN 4 ft A A 4 ft 1 m (a) D (b)