A force of `vecF = (4hati-3hatj+5hatk)N` is applied at a point whose position vector is `vec r = (7hati+4hatj-2hatk)m`. Find the torque of force about the origin.

Explanation

`vecr = 7hati + 4hatj - 2hatk`
`vecF = 4hati - 3hatj + 5hatk`
Torque , `vectau = vecr xx vecF`
`vectau = |{:(hati , hatj , hatk),(7,4,-2),(4,-3,5):}|`
`vectau = hati (20-6) -hatj(35+8) + hatk (-21-16)`
`vectau = (14hati - 43 hatj - 37 hatk)`Nm