Consider a uniaxial bar with the crosssectional area \(A=2 \times 10^{-4} \mathrm{~m}^{2}\), as shown in figure 5.2. If an axial force \(F=100 \mathrm{~N}\) is applied to the bar, determine the surface traction on the plane whose normal is at an angle \(\theta\) from the axial direction.

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F F T(n) n S Figure 5.2 Equilibrium of a uniaxial bar under axial force F