Problems 12 to 15 The boom crane supports 12 kN load. Show the equations needed to determine the stress at location B. Include +/- for normal stresses and indicate zero (0) stresses with a "0" with exploration 15m 12. 13. 14. 15. W6x 12 bears 12m 0:0 12 AN Normal stress on the top at point B. (A) F/A-My/I (B) F/A+My/I (C) -F/A-My/I (D) -F/A + My/I 12m Normal stress at the center at point B. (A) 0 (B) F/A- (C) -F/A (D) -F/A + My/1 Normal stress on the bottom at point B. (A) F/A-My/1 (B) F/A + My/1 (C) -F/A-My/1 (D) -F/A + My/1 Shear stress at the center at point B. (A) 0 (B) VQ/It (C) V/A (D) Tc/J