$4\mathrm{.}31$ Using the mathematical method of joints, determine the force in each member of the truss in Fig. $4-35.$ Ans. $($all units are kN $)A_y=58\mathrm{.}9,D_y=31\mathrm{.}1,D_x=40,AB=106\mathrm{.}2C,AF=88\mathrm{.}3T,BC=86\mathrm{.}7C,BE=2C,BF=60T,CE=31\mathrm{.}1T,CD=56\mathrm{.}1C,ED=86\mathrm{.}7T,FE=88\mathrm{.}3T$