7-30. The bars of the truss each have a cross-sectional area of 780 mm². Determine the average normal stress in each member due to the loading P = 40 kN. State whether the stress is tensile or compressive. a9m -1.2m -1.2 m- 0.75 P

If the load has a weight of 2940 N, determine the magnitude of the maximum compressive normal stress developed on the cross section of the supporting member at section a- a, where L= 700 mm, and the radius r= 30 mm. Section a - a 98.089 MPa O 49.564 MPa 8.665 MPa 96.009 MPa O 96.945 MPa O 97.049 MPa

The rectangular bar is connected to the support bracket with a 19-mm-diameter pin. The bar width is w = 75 mm and the bar thickness is 20 mm. Each side of the bracket has the same dimensions as the bar. The average shear stress in the pin cannot exceed 120 MPa, the bearing stress in the bar cannot exceed 150 MPa, and the bearing stress in the bracket cannot exceed 150 MPa. Determine the maximum value of Pmax that can be supported by the structure. Answer: Pmax=

The bar has a cross-sectional areao of 490(10-6)m2. It is subjected to triangular axial distributed loading along its length which is 0 at x= 0 and 9 kN/m at x= 1.5 , and to two concetrated loads Determine the average normal stress in the bar as a function of x for 0 <_x < 0.6m