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S.T the moment of a couple does not depe...

S.T the moment of a couple does not depend on the point about which the body rotates.

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Let A & B be points on a body at which the couple of forces act. Let O be the point of rotation FIG
Moment of the couple `=-(vecFxxvecAO+vecFxxxOvecB)=(vecFxx(vecAO+vecOB)`
`=(vecFxxvec(AB))`
i.e `vectau=vec(AB)xxvecF`
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