Question
A force of 39 kg wt is acting at a point $P(-4, 2, 5)$ in the direction $\langle 12\hat{i} - 4\hat{j} - 3\hat{k} \rangle$. The moment of this force about a line through the origin having the direction of $\langle 2\hat{i} - 2\hat{j} + \hat{k} \rangle$ is: