A light rod is long and is pivoted at its mid-point

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A light rod

AC

0.80\,\text{m}

long and is pivoted at its mid-point

O

. A downward force of

10\,\text{N}

acts at end

A

(left end). Another downward force of

8\,\text{N}

acts at a point

0.20\,\text{m}

to the right of

O

. Taking anticlockwise torque as positive, the net torque about

O

is (a)

-2.4\,\text{N m}

(b)

+5.6\,\text{N m}

(c)

+2.4\,\text{N m}

(d)

+0.8\,\text{N m}