2. A wood beam AB supporting two concentrated loads P (see Fig. (a)) has a rectangular cross section of width b=100 mm and height=150 mm (see Fig. (b)). The distances from the ends of the beam to the loads are a=0.5 m. Ignoring the weight of the beam, determine the maximum permissible value Pmax of the loads if the magnitude of the allowable bending stress is allow = 11 MPa and the magnitude of the allowable horizontal shearing stress is Tallow=1.2 MPa. a B