Question

Find the torque of a force f=7i+3j+5k about the origin.The force acts on a particle whose position vector is r=i+j+k

Answer 1

here we will use the formula for Cross product as all torque force and position are vector quantities.
so

torque= position× force vector
now just apply the formula of Cross product and you will get the answer as..
2i+2j-2k