A prismatic bar with rectangular cross section (20 mm x 40 mm) and length 2.8 m is subjected to an axial force P-70 kN that produces an elongation 6-1.2 mm. Two stress elements, A and B are considered as shown. Circle the correct answer: LI The normal stress a, acting in the bar material is: (b)-87.5 MPa (a) 87.5 MPa 1.2 The normal strain e, produced in the bar is: (a) 429 x 10 (b)-429 x 106 1.3 Given that Poisson's (c)-214.5 x 10 ratio for the material is 0.3, then c, is: (c) 64.35 x 10 (a)-128.7 x 10 (b) 128.7 x 10 (c) 43.75 MPa (d)-43.75 MPa (d) 429 x 10 mm 14 The new height in mm for the cross section as a result of the loading is: (4)-33.995 (b) 39.995 (c) 39.997 (d)-39.997 1.5 The normal stress in MPa acting on stress element B which is inclined at 45 degrees is (a) 43.75 (b)-43.75 (d) 87.5 (c) 0.0 1.6 The shear stress in MPa acting on element B is: (4) 43.75 (b) 21.875 1.7 The shear stress in MPa acting on element A is: (b) 43.75 (A) 21.875 (c) 30.935 L. 15 (c) 30.935 (d) 15.465 (d) 0.0 (d)-64.35 x 10 mm 0-