The lamina thickness of a composite [0/90/] plate is 10 mm. Given that the Young\\\'s modulus E for the laminas with O ^ 0 and 90° fiber direction are 45 GPa and 12 GPa, respectively. Find the bending stress o on the bottom and top surface of the plate when the bending moment M = 500 N.m is applied. Also, calculate the bending stiffness of the plate knowing that the width of the plate is 60 mm.