A hollow steel shaft ACB of outside diameter 50 mm and inside diameter 40 mm is held against rotation at ends A and B (see figure). Horizontal forces P are applied at the ends of a vertical arm that is welded to the shaft at point C.
Determine the allowable value of the forces P if the maximum permissible shear stress in the shaft is 45 MPa. (Use Eqs. 3-46a and b of Example 3-9 to obtain the reactive torques.)

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