Four boxes are placed on a uniform 28-lb wooden plank which rests on two sawhorses. Knowing that the weights of boxes B and D are 9 lb and 90 lb, respectively, determine the range of values of the weight of box A so that the plank remains in equilibrium when box C is removed.

Transcribed Image Text:

4.5 ft 4.8 ft LSft 15 ft B. 3 ft- -3 ft-