I. a) What are the components of the transformed stiffness matrix [C] for an orthotropic material in a coordinate system rotated 90 about the 1-axis? Express your answer in terms of the original components of the stiffness matrix [C]. b) Using rotational relationships, determine the number of independent elastic constants for a unidirectional, continuous fiber composite material with square packed fibers have (i.e., square symmetry about the 1-axis, see figure.) Use your result from part a) (you can assume at least orthotropic symmetry).