03. A 12 foot length of 2" x 12" lumber (white pine), weighing 72.0 lbs, is sitting on the ground. What minimum upward force is needed to lift the one end of the wood, assuming the other end does not slide, but rather acts as the axis of rotation. Ignore any bending of the wood. II 04. Assume the same piece of lumber as problem 03 above is again sitting on the ground. This time there are two packages of roofing shingles sitting on the wood. One package, that is unopened, weighs 80 lbs (w1) and is positioned 3.50 feet from the left end of the board; while the other package, that is not a full package, weighs 55 lbs (w2) and is positioned 4.50 feet from the right end of the board as shown in the diagram to the right. What minimum upward force is needed to lift the right end of the board? Ignore any bending of the wood. Problems 03 and 04 F