The internal loadings at a section of the beam consist of an axial force of \(500 \mathrm{~N}\), a shear force of \(800 \mathrm{~N}\), and two moment components of \(30 \mathrm{~N} \cdot \mathrm{m}\) and of \(40 \mathrm{~N} \cdot \mathrm{m}\). Determine the principal stresses at point \(A\). Also calculate the maximum in-plane shear stress at this point.

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B 50 mm 200 mm 40 Nm 50 mm 100 mm 30 Nm 500 N 800 N