Force F = (1.0 N) + (-1.0 N) acts on a pebble with position vector r = (2.70 m) + (-2.1 m) , relative to the origin.
(a) What is the resulting torque acting on the pebble about the origin? (in i, j, and k)
(b) What is the resulting torque acting on the pebble about a point with coordinates (-5.0 m, 8.0 m, 3.0 m)? (in i, j, and k)