Strains are measured on the surface of a brass alloy part as follows: εxx = 1600 10−6, εyy = 1300 10−6, and γxy = 1500 10−6×××estimate the in-plane stresses σxx, σyy, and τxy, and also the strain εzz normal to the surface. (assume that the gages were bonded to the metal when there was no load on the part, that there is no yielding, and that no loading is applied directly to the surface, i. e., σzz= τyz= τzx= 0).