Question 1. The plane NN’ makes an angle 0=30° with respect to the cross section of theprismatic bar shown in Figure. The dimensions of the rectangular cross section of the bar are 3cmx6cm. Under the action of an axial tensile load P, the normal stress of NN' plane is ơn =60 MPa. a.Determine the value of axial load P b.Determine the shear stress t on the NN' plane c. Determine the maximum shear stress in the bar. P

Problem 2. [Concepts: Internal forces in 2D and average normal stress] The bars of the truss each have a cross-sectional area of 1.25 in². a) Determine the average normal stress in each member due to the loading P = 8 kip. State whether the stress is tensile or compressive. b) If the maximum average normal stress in any bar is not to exceed 20 ksi, determine the maximum magnitude P of the loads that can be applied to the truss. 4 ft 4 ft 4 E 0.75 P 0

30 mm C A B 150 mm M 150 mm 300 mm 30 mm - determine the bending stress developed at points A, B, and C. Sketch the bending stress distribution on the cross section. - Assume that the cross-section has a moment of inertia about the neutral axis of 1.907 x 10-4 m². - Assume that the neutral axis is located 97.5 mm from the bottom of the cross-section - Assume the internal bending moment M = 61.4 kN.m

The triangular plate is fixed at its base, and its apex A is given a horizontal displacement of 5 mm. Calculate the shear strain, Yxy, at A. Also, calculate the average normal strain & along the x' axis. 800 mm 45% 45° 800 mm 5 mm