A force acts at a point

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Torque and Rotational Dynamics · Torque and Rotational Dynamics

Problem

A force

\mathbf{F} = 2\hat{i} + \hat{j} - \hat{k}

acts at a point

A

, whose position vector is

2\hat{i} - \hat{j}

. The moment of

\mathbf{F}

about the origin is (1)

\hat{i} + 2\hat{j} - 4\hat{k}

(2)

\hat{i} - 2\hat{j} - 4\hat{k}

(3)

\hat{i} + 2\hat{j} + 4\hat{k}

(4)

\hat{i} - 2\hat{j} + 4\hat{k}