F Problem 3: Known: h = 3.6 ft, L1 = 6.6 ft, L2 = 3.0 ft, F1 = 9 kips There is a pin at A and a roller at D. Assume all joints are pinned. Compute the force in all members of the truss. Indicate tension vs. compression. a) AB b) BC c) AD d) CD e) BD 12 th- ton H 3 m Problem 4: Use method of section to determine the force in members LK, KC, and CD of the Pratt truss. Indicate if the members are in tension or compression ANT G C D TEF |-2 m-1-2 m-1-2 m-1-2 m-l-2 m-|-2 m- 20 kN 30 kN 40 KN