Problem F2-12 Statics Hibbeler 12th (Chapter 2)

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Determine the magnitude of the resultant force and its direction theta measured counterclockwise from the positive x axis.
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Hello teacher! I'm from Viet Nam and that's a wonderfull lecture.
Thanks for your lecture and i have a question
Can you explain about i and j
Thanks very much !!

AToHoangKhang
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How is F1x positive if the it’s on the negative side of the graph?

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