the shear modulus of steel is 8.1x10^10N/m^2. a steel nail of radius 7.5x10^-4m projects 0.040m horizontally outward from thw wall. a man hangs a wet raincoat of weight 28.5N from the end of the nail. assuming that the wall holds its end if the nail, what is the vertical deflection of the other end of the nail?