A Plane Stress Element on a Bar in Uniaxial Stress $\sigma _ { \theta } = 78 \mathrm { MPa }$

Multiple Choice

A plane stress element on a bar in uniaxial stress has a tensile stress of $\sigma _ { \theta } = 78 \mathrm { MPa }$ (see figure) . The maximum shear stress in the bar is approximately:

A) $29 \mathrm { MPa }$
B) $37 \mathrm { MPa }$
C) $50 \mathrm { MPa }$
D) $59 \mathrm { MPa }$