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A torque of 400 lb-ft is applied to the square tube with constant 0.10-in. wall thickness. Determine the smallest permissible dimension a if the

A torque of 400 lb-ft is applied to the square tube with constant 0.10-in. wall thickness. Determine the smallest permissible dimension a if the shear stress is limited to 6500 psi. t = 0.10 in. FIG. P3.67

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