The circle of diameter d =9 in. is scribed on an unstressed aluminum plate of thickness 3/4 in. Forces acting !3! 20 in. 20 in. in the plane of the plate later cause normal stress o, = 12 ksi and 10 x10 psi and v = 1/3, determine the 0, = 20 ksi. For E change in (a) the length of diameter AB , (b) the length of diameter %3D CD. (c) the thickness of the plate, (d) the volume of the plate