Problem 339 A torque of 450 lb·ft is applied to the square section shown in Fig. P-339. Determine the smallest permissible dimension a if the shearing stress is limited to 6000 psi.
Problem 339
Where: $T = 450 \, \text{lb}\cdot\text{ft} = 450(12) \, \text{lb}\cdot\text{in}$
$A = a^2$
$\tau = 6000 \, \text{psi}$
$450(12) = 2a^2(0.10)(6000)$
$a = 2.12 \, \text{ in}$ answer
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