Consider the cable-suspended plate below. All cables are equal length. All sides of the plate are equal in length. Determine the tension, T in each cable. Use the following values: r = 100 mm and m = 8.5 kg 2.5r 120° 120° В 120°

Four sets of flexible cables, spaced at 120° intervals, are used to stabilize a 400-ft communications tower. The tower and one cable from each set is shown in Fig. The weight of each tower is 40 lb/ft, and the communica- tions equipment at the top weighs 2000 lb. Determine the axial forces transmitted by transverse cross sections at points A, B, C, and D of the tower. 50 ft 30 1500 lb 100 ft B 40° 1250 lb 100 ft 50° 1000 lb 100 ft 50 ft 60 750 Ib

Joint O of a space frame is supported by spring OA and is subjected to three member forces. Member 1 lies in the x-z plane while member 2 lies in the x-y plane. If the magnitude of the force in member 1 is 200N, which of the following best approximates the magnitude of the force exerted by member 3, F3 on joint  O? Show free body diagram.

If the tension in cable DE is 455 N, determine the moments of this tensile force (as it acts at point D) about point O and about line OF. EQ 2.3 m Answers: BC=CD = 2.2 m MOF= 3.0 m Moi -1203.39 i 2.3 m 3.1 m 1.3 m i+ i N.m 1.7 m 39° j+ i k) N-m