9. (10 points) Consider a fiber of radius "r" embedded up to a length "I" in a matrix as shown in the figure below. Matrix 2r Fiber P When the fiber is pulled, the adhesion between the fiber and the matrix produces a shear stress T at the interface. In a composite system which contains the same fiber and the matrix, the fiber fracture stress of equal to eight times the max shear stress Tmax that the interface can bear, what fiber aspect ratio is required to break the fiber than pull it out?