Extracted text: A hollow steel shaft has length of 4 meters with a circular cross-section. The outer and inner diameters of the cross-section are 75 mm and 30 mm, respectively. The steel has G = 77 GPa and the shaft has an angle of twist of 2 degrees. Determine the value of the parameter J in m^4. *
Extracted text: O 3.935 x 10^-6 O 4.234 x 10^-6 O 3.026 x 10^-6 O 1.786 x 10^-6