The location of the centroidal z axis for the section of a beam is shown. The beam is transmitting a maximum bending moment of 2000 lb in about the z axis and a maximum transverse shear force of 500 lb in the y direction. All wall thicknesses are 0.125 in. (a) Determine the maximum transverse shear stress in each of the vertical walls. (b) Determine the maximum shear stress in the beam. y 1.515 1.50 T 0.25 3.00