Physics

Problem

A horizontal uniform beam AB of length

1.5\,\text{m}

is hinged to a wall at A. A shop sign of mass

12\,\text{kg}

is suspended from the free end B. To keep the beam horizontal, a worker pushes upward at a point C located

0.50\,\text{m}

from the hinge with a force acting perpendicularly to the beam. Neglect the mass of the beam and take

g = 9.8\,\text{m s}^{-2}

. The minimum magnitude of the force required is a)

3.53 \times 10^{2}\,\text{N}

1.18 \times 10^{2}\,\text{N}

1.76 \times 10^{2}\,\text{N}

5.88 \times 10^{2}\,\text{N}