1: (18 marks) 2. 3. Consider a point in a structural member that is subjected to plane stress. Normal and shear stresses acting on horizontal and vertical planes at the point are shown. If σ = 15 MPa, determine the angle e, corresponding to the orientation of the maximum in-plane shear stress. a. 66.7° or -23.3° b. 60.7° or -29.3° c. 77.2° or -12.8° d. 56.7° or -33.3° e. 54.0° or -36.0° 26 MPa 10 MPa Determine the maximum in-plane shear stress and the average normal stress values acting at the point in the previous problem. a. Tin-plane max 1 b. Tin-plane max 1 C. Tin-plane max d. Tin-plane max e. Tin-plane max = 37.9 MPa; Gaverage = 17.5 MPa 28.9 MPa; Gaverage = 2.50 MPa 65.4 MPa; Gaverage = 50.0 MPa 49.8 MPa; Gaverage = 32.5 MPa 84.1 MPa; Gaverage=70.0 MPa Identify the stress-element that best depicts the maximum in-plane shear stress and the average normal stress values found in the previous problem. a.