Components of a 2-D stress tensor in Cartesian coordinate are $\sigma_{xx} = 5.0\,\text{MPa}, \sigma_{yy} = -10.0 \, \text{MPa}$, and $\tau_{xy} = 2.0 \,\text{MPa}$. The traction vector ($\vec{T}$) in MPa acting on a plane having outward normal $\hat{n} = \frac{\sqrt{3}}{2} \hat{i} - \frac{1}{2} \hat{j}$ is