The tube is 5 mm thick and has the mean dimensions shown. Determine the average shear stress at points A and B if the tube is subjected to a torque of T = 500 N ⋅ m. Show the shear stress on volume elements located at these points. Neglect stress concentrations at the corners.

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20 mm 20 mm A B 30 mm 50 mm 50 mm T 30 mm