Pipe (2) is supported by a pin at bracket c and by tie rod (1). the structure supports a load p at pin b. tie rod (1) has a diameter of 11 mm and an allowable normal stress of 85 mpa. pipe (2) has an outside diameter of 42 mm, a wall thickness of 3 mm, and an allowable normal stress of 150 mpa. assume x1 = 3.0 m, x2 = 2.0 m, and y1 = 4.2 m. determine the maximum load pmax that can be supported by the structure without exceeding either allowable normal stress.