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Find the moment about (1,-1,-1) of the f...

Find the moment about (1,-1,-1) of the force `3hati+4hatj-5hatk` acting at (1,0,-2)

Text Solution

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`vecF=3hati+hatj-5hatk`
`vecPA=P.V. of A-P.V. of P`
`=(hati-2hatj)-(hati-hatj-hatk)`
`=-hatj+hatk`
Required vector moment = `vecPAxxvecF`
`=(-hatj+hatk)xx(3hati+4hatj-5hatk)`
`=|{:(hati,hatj,hatk),(0,-1,0),(3,4,-5):}|`
`=hati+3hatj+3hatk`
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