Solution to a frames and machines problem Hibbeler 6 3f

Detailed explanation of solution to a textbook frames and machines problem.
Hibbeler, Engineering Mechanics: Statics Problem 6-3f

0:00 Introduction
0:44 Drawing the first free body diagram (FBD)
2:01 Identifying the 2-force member in equilibrium
2:52 Reactions at pin A
3:33 Determining sense of the force at B
4:17 Determining senses of reaction forces at A
6:40 Free body diagram of pulley
8:16 Applying equations of equilibrium to FBD of pulley
9:51 FBD of link BC
11:50 Explaining the two 400N forces at the pulley connection
12:18 What NOT to do on FBDs of frames and machines
13:07 Applying equations of equilibrium to FBD of beam AB
15:44 Determining force magnitudes and rounding answers
16:53 Thinking about and checking final answers
17:33 Using 3-force member to check answer