2.

A 1/8" radius steel rod that is 2 ft long has a 20,000 in-lbs external torque

applied. [J = (T4)/2]

A. What is the polar moment of inertia for the rod?

B. If the Modulus of Rigidity for the steel bar is 18 X 10³ Ksi, what is the

expected twist of the bar in degrees?