( A_r = A_p - A_rod = 7.07 - \frac\pi \times (1.5)^24 = 7.07 - 1.77 = 5.30 \text in^2 )
( F_ret = 1500 \times 5.30 = 7,950 \text lbf )
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( F_ext = P \times A_p = 1500 \times 7.07 = 10,605 \text lbf )
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