HW_4 Solutions - FBD of just the pulley first Now let's...

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FBD of just the pulley first Now let’s look at member BED: FBD 0 300 300 0 300 600 600 ) 6 ( 300 ) 3 ( = + + - = = = - - = = - = X X X Y Y Y Y Y B B E lb F lb B B lb lb F lb E ft ft E M Too Many unknowns Move to member FEC lb E ft lb ft E M X X C 225 0 ) 3 ( 300 ) 4 ( = = - - = Using this result in the previous equation lb B B lb F X X X 75 0 225 300 = = + + - = Back to Bar FEC lb C C lb F X X X 75 0 225 300 = = + - = Member ABC lb C ft lb ft lb ft C ft lb M Y Y A 100 0 ) 3 ( 300 ) 4 ( 75 ) 6 ( ) 8 ( 75 = = + + - - =
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