3/73 The light right-angle boom which supports the 400- kg cylinder is supported by three cables and a ball- and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. A C 0.75 m 1 m 0.75 m y B Ο 400 kg 1.5 m D 2 m E 1 m 1 m x 3/112 Determine the tension T required to hold the rec- tangular solid in the position shown. The 125-kg rectangular solid is homogeneous. Friction at D is negligible. 0.4 m D 0.125 m VT C 0.5 m A 0.4 m B 0.3 m