A circular tube of inner radius r1 and outer radius r2 is subjected to a torque produced by forces P = 900 lb (see figure). The forces have their lines of action at a distance b = 5.5 in. from the outside of the tube.
If the allowable shear stress in the tube is 6300 psi and the inner radius r1 = 1.2 in., what is the minimum permissible outer radius r2?

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