Beam ACB has a pin support at A and is supported at C by a steel column with a square cross section (E 5 190 GPa, b 5 42 mm) and height L 5 5.25 m. The column is pinned at C and fixed at D. The column must resist a load Q at B with a factor of safety of 2.0 with respect to the critical load. The maximum permissible value of Q is approximately:
(A) 3.0 kN
(B) 6.0 kN
(C) 9.4 kN
(D) 10.1 kN
(B) 6.0 kN
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