·1.5a- 5. Determine the location of the shear centre for the following symmetric cross sections. Assume the load to act perpendicular to the axis of symmetry and that the thickness t is small compared to the overall dimensions of the cross section. For problems (a) and (c), leave the solution in terms of the second moment of area about the axis of symmetry. (Positions to the right of point O: (a) 4ta'/I; (b) 4R/; (c) 6.126 ta*/I) a S -2a- (a) ° (b) (c) d -3