Physics

Physics

Problem

The position vector of a point of application of a force is r=2 i+3 j−k m\mathbf{r}=2\,\mathbf{i}+3\,\mathbf{j}-\mathbf{k}\,\text{m} and the force is F=5 i−4 j+2 k N\mathbf{F}=5\,\mathbf{i}-4\,\mathbf{j}+2\,\mathbf{k}\,\text{N}. The torque about the origin (in N m) is a) −2 i+9 j+23 k-2\,\mathbf i+9\,\mathbf j+23\,\mathbf k b) 2 i−9 j−23 k2\,\mathbf i-9\,\mathbf j-23\,\mathbf k c) 2 i+9 j−23 k2\,\mathbf i+9\,\mathbf j-23\,\mathbf k d) 2 i−9 j+23 k2\,\mathbf i-9\,\mathbf j+23\,\mathbf k

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