5.23 A truss is made by hinging two uniform. 150-N rafters as shown in Fig. 5-21. They rest on an essentially frictionless floor and are held together by a tie rope. A 500-N load is held at their apex. Find the tension in the tie rope. Ans. 0.28 KN CHAP. 5] EQUILIBRIUM OF A RIGID BODY UNDER COPLANAR FORCES 67 5.24 A 900-N lawn roller is to be pulled over a 5.0-cm high curb as shown in Fig. 5-22. The radius of the roller is 25 em. What minimum pulling force is needed if the angle & made by the handle is (a) ( and (b) 30? (Hint: Find the force needed to keep the roller balanced against the edge of the curb, just clear of the ground.) Ans. (a) 0.68 KN; (b) 0.55 kN 25 cm (30" 0.70 L 2 5.0 cm Fig. 5-22 Fig. 5-23 5.25 In Fig. 5-23. the uniform beam weighs 500 N. If the tie rope can support 1800 N. what is the maximum value the load Fy can have? Ans. 0.93 KN