4-4 The coupling shown in Fig. 4-4 is constructed from steel of rectangular cross- section and is designed to transmit a tensile force of 30 kN. If the bolt is of 16 mm diameter calculate: (a) the shear stress in the bolt (b) the direct stress in the plate (c) the direct stress in the forked end of the coupling 30 kN 50 mm 6 mm 30 kN 6 mm 15 kN 15 kN 6 mm 30 kN