1.

Find the torque due to force vec(F)=2g=hat(i) -3hat(j)+4hat(k) newton acting a point with position vector vec(r )=3hat(i) + 2hat(j) + 3hat(k) metre about the origin :

Answer»

`17hat(i) + 6hat(j) -13hat(k)`
`17hat(i) - 6hat(j) -13hat(k)`
zero
None of these

Solution :`VEC(tau)=vec(r)xxvec(F)=(3hati + 2hatj + 3hatk) xx (2hati - 3hatj +4HATK)`
`vec(tau)=`
`HATI(8-)(-9)+hatj(6-12)+hatk (-9-4)`
`17hati - 6hatj -13hatk`


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