The cast iron inverted T-section supports two concentrated loads of magni- tude P. The working stresses are 48 MPa in tension, 140 MPa in compression, and 30 MPa in shear. (a) Show that the neutral axis of the cross section is located at d = 48.75 mm and that the moment of inertia of the cross-sectional area about this axis is I = 11.918 x 106 mm4. (b) Find the maximum allowable value of P. m 3 m 1.0 m 15 mm NAT FIG. P5.86 C 150 mm 150 mm 15 mm