Q. The moment of the force, $\vec{F} = 4\hat{i} + 5\hat{j} - 6\hat{k}$ at (2, 0, -3), about the point (2, -2, -2), is given by
A) $-7\hat{i} - 8\hat{j} - 4\hat{k}$
B) $-4\hat{i} - \hat{j} - 8\hat{k}$
C) $-8\hat{i} - 4\hat{j} - 7\hat{k}$
D) $-7\hat{i} - 4\hat{j} - 8\hat{k}$
Explanation
[Solution] $\vec{r} = (0, 2, -1)$; $\vec{r} \times \vec{F} = -7\hat{i} - 4\hat{j} - 8\hat{k}$. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.