The aluminum alloy bar has a circular cross section with 20-mm diameter, length L = 120 mm, and a shear modulus of 28 GPa. If the distributed torque is uniform and causes the end of the bar to rotate...

The aluminum alloy bar has a circular cross section with 20-mm diameter, length
L
= 120 mm, and a shear modulus of 28 GPa. If the distributed torque is uniform and causes the end of the bar to rotate 0.5^o, what is the magnitude of the maximum shear stress in the bar?