Physics

Problem

A student pushes a door that is

0.90\,\text{m}

wide. In which case will the torque about the hinge be zero? a)

40\,\text{N}

force applied perpendicular to the door

0.30\,\text{m}

from the hinge b)

40\,\text{N}

force applied at

5^{\circ}

to the plane of the door at its free edge c)

40\,\text{N}

force applied parallel to the door surface at its free edge d)

40\,\text{N}

force applied perpendicular to the door at its mid-point