일반물리학 1 — Rolling, Torque, and Angular Momentum: Problem 23

23 Force \(\vec{F} = (2.0 \text{ N})\hat{i} - (3.0 \text{ N})\hat{k}\) acts on a pebble with position vector \(\vec{r} = (0.50 \text{ m})\hat{j} - (2.0 \text{ m})\hat{k}\) relative to the origin. In unit-vector notation, what is the resulting torque on the pebble about (a) the origin and (b) the point \((2.0 \text{ m}, 0, -3.0 \text{ m})\)?