Question: At a point in a structure subjected to plane stress, the stresses are (x = - 4100 psi,(y = 2200 psi, and Txy = 2900

At a point in a structure subjected to plane stress, the stresses are (x = - 4100 psi,(y = 2200 psi, and Txy = 2900 psi (the sign convention for these stresses is shown in Fig. 7-1), A stress element located at the same point in the structure (but oriented at a counterclockwise angle (1 with respect to the x axis) is subjected to the stresses shown in the figure ((b, Tb, and 1800 psi).
Assuming that the angle (1 is between zero and 90°, calculate the normal stress (b, the shear stress Tb, and the angle (1?

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