A crane consists of a post AB, a boom CD, and a brace EF, weighing, respectively, 400 lb,...

A crane consists of a post AB, a boom CD, and a brace EF, weighing, respectively, 400 lb, 600 lb, and 300 lb. The crane supports a load of 3000 lb, as shown. The post is pin-connected at point A and lateral support at point B. Thus, the reaction at point B will be horizontal. Determine the reactions at points A and B.

Problem