. Force N N acts

on a particle with position vector

m m . What are (a) the

torque on the particle about the origin, in

unit-vector notation, and (b) the angle between

the directions of and ?

on a particle with position vector

m m . What are (a) the

torque on the particle about the origin, in

unit-vector notation, and (b) the angle between

the directions of and ?