2.90 The dimensions are b = 3 ft and h 1 4 ft and F = 300 lb. The vector sum of the forces acting on the truss is zero, and the sum of the moments of the forces about the point where A, and Ay act is zero. (a) Determine the forces A., Ay, and B. (b) Determine the sum of the moments of the forces about the point where the force B acts. A, Ay 76 60° O F/60 Problems 2.89/2.90 60° ←b✦✦b✦|◄b▬▬|▬▬b▬★▬b▬▬▬▬b▬ B

2.90 The dimensions are b = 3 ft and h 1 4 ft and F = 300 lb. The vector sum of the forces acting on the truss is zero, and the sum of the moments of the forces about the point where A, and Ay act is zero. (a) Determine the forces A., Ay, and B. (b) Determine the sum of the moments of the forces about the point where the force B acts. A, Ay 76 60° O F/60 Problems 2.89/2.90 60° ←b✦✦b✦|◄b▬▬|▬▬b▬★▬b▬▬▬▬b▬ B