A motor shaft, with a diameter of 18 mm, experiences an applied compressive load and torque, which creates the corresponding state of stress at the surface of the shaft, as shown in the figure.
$$P = 12500 N$$
$$T = 160 N-m$$
$$\tau$$
$$\sigma_x$$
Part A
Determine principal stresses, $$\sigma_1$$, $$\sigma_2$$ and $$\sigma_3$$ (in MPa, rounded to the nearest whole number). Input answers separated by a comma.