Rotation revisited!!!!!!!!!!!!!11?

Question

Force F = 2Ni - 3Nk acts on a particle with position vector r = 0.5mj - 2.0mk relative to the origin. In unit vector notation, what is the resulting torque on the pebble about (a) the origin and (b) the point (2.0, 0, -3.0)?

Answer 1

a) use the formula

torque = (yFz - zFy)i + (xFz - zFx)j + (xFy - yFx) k

b) reconsider the position vector r'

then solve as solving in a