A lightweight horizontal beam long is pinned to a wall at its left end

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

Problem

A lightweight horizontal beam

3\,\text{m}

long is pinned to a wall at its left end. A

50\,\text{N}

upward force is applied at the right end. About which one of the following pivot locations on the beam would the torque of the

50\,\text{N}

force be zero? (a) At the wall pin,

0\,\text{m}

from the left end (b) At the right end,

3.0\,\text{m}

from the left end (c) At the midpoint,

1.5\,\text{m}

from the left end (d) At a point

1.0\,\text{m}

from the left end