4cex. Energy Methods Examples • Ex. 4c.1 
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F_{BC}sin(60°) = P and F_{AB} + F_{BC}cos(60°) = 0 Solving for the internal forces: F_{BC} = 1.15 P and F_{AB} = –0.577 P 
FBD of Joint B 
The internal energy of a system is:
The work done by the applied force P equals the internal energy stored: Solving for d:
For P = 20,000 lb:

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