EXAMPLE 3.7 Determine the force in members BC and MC of the K-truss shown in Fig. 3-28a. State whether the members are in tension or compression. The reactions at the supports have been calculated. La K J I H M N Ax=0 A- Ba 3 m C G D E F -4.5 m 4.5 m-4.5 m4.5 m-4.5 m-4.5 m -4.5 m Ay = 14.5 kN 6 kN 7.5 kN 9 kN (a) Gy=8 kN 3.5 THE