Question: Problems 2 . ( 2 4 points ) The external torques are shown in the image. Determine the angle of twist ( in rad )

Problems
2.(24points) The external torques are shown in the image. Determine the angle of twist (in rad) for point D relative to point A if T=20Nm,d=15mm, and L=6m. Section DC is made of 2014-T6 aluminum, section CB is made of A-36 Steel, and section BA is made of C83400 copper. For 3 points extra credit on Exam 2, calculate the maximum shear stress in the shaft and indicate in which section it is located.
Problems 2 . ( 2 4 points ) The external torques

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