A standard steel pipe is to be simply supported at its ends and carry a single concentrated load of 2800 lb at its center. The pipe is to be made from AISI 1020 hot-rolled steel. The minimum design factor is to be 4 based on yield strength for either bending or shear. Specify a suitable pipe size from Appendix A-12 if the length of the pipe is
(a) 1.5 in
(b) 3.0 in
(c) 4.5 in
(d) 6.0 in
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