A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm) of length L 5 4.25 m hangs from a rigid surface and is subjected to a temperature increase ?T 5 50 °C. The column is fixed at the top and has a small gap at the bottom. To avoid buckling, the minimum clearance at the bottom should be approximately:
(A) 2.55 mm
(B) 3.24 mm
(C) 4.17 mm
(D) 5.23 mm
(A) 2.55 mm
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Fill in the blank(s) with the appropriate word(s).