A W 12 X 14 wide-f lange beam (see TableF-1(a), Appendix F) is simply supported with a span length of 120 in. (see figure). The beam supports two anti-symmetrically placed concentrated loads of 7.5kips each. At a cross section located 20 in. from the righth and support, determine the principal stresses s₁ and s₂ and the maximum shear stress t max at each of the following locations: (a) the top of the beam, (b) the top of the web, and (c) the neutral axis.

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20 B L |Yo -b₁- C 17 17 H D -xo