1. The problem statement, all variables and given/known data The figure shows a frame with a 100N object hanging on it. Determine the magnitude and direction of forces exerted on AB and BC respectively. 2. Relevant equations ∑Fx=0, ∑Fy=0, ∑M=0 3. The attempt at a solution I believe this question is unsolvable. The free body diagram of the frame is as follows: There are 4 unknowns in the diagram but we can only write down 3 equations. Hence, there is no way we can solve this problem. Is my reasoning correct?