4.125 The bar is loaded by the forces FB = 2i + 6j + 3k (kN), Fc i 2j+2k (kN), and the couple Mc =2i+j-2k (kN-m). Determine the sum of the moments of the two forces and the couple about A. 4.126 The forces FB = 2i+ 6j + 3k (kN), 2j+2k (kN), Fc i and the couple Mc = Mcyj + Mczk (kN-m). dsb s Determine the values of Mcy and Mcz so that the sum of the moments of the two forces and the couple about A is zero. A FB Mc B C 1 m- 1 m Fc Problems 4.125/4.126