Consider the pinned-free plate illustrated below, which has unit length in the r- and z-directions. The plate is acted on by the stress, oy (2, z), defined below. To maintain equilibrium, a point load, F, is applied to the plate at some distance, r, from the pinned end. Determine the value of F and r. ay (1,2)= -2x, - 1, G(X,Z) 0 x1/2 1/2 x1