Solution to 4-84

# Solution to 4-84 - Solution to 4.84 - Coordinate system was...

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Solution to 4.84 - Coordinate system was given in problem ,80, xz F F F lbs = ( ) ( ) ( ) ˆ moment about x axis due to 80 moment about y axis due to 0 ˆ moment about z axis due to 160 x y z M F i ft lbs M F ft lbs M F k ft lbs = = −− = = = = 1,0,0 0,1, 0 0,0,1 x y z e ft e ft e ft = = = Moment about line: ( ) LL M e rF =  Choose 4,2,2 r ft = . This was chosen for 2 reasons: 1) It involves the point (4,2,2) where the force is applied 2) It involves the origin, which intersects all 3 lines for which information is given (all three axes)

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( ) ( ) ( ) ( ) ( ) ˆ ˆˆ ˆ 4 2 2 2 160 4 2 320 2 80 z zx x xz i jk r F ft ft ft F i F F j F k ft lbs F lbs F ×= = + ( ) ( )( ) ( ) ( ) ( )( ) ( )
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## This note was uploaded on 09/18/2011 for the course ENGR 200 taught by Professor Mullen during the Spring '08 term at Case Western.

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Solution to 4-84 - Solution to 4.84 - Coordinate system was...

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