Question

A heavy bank-vault door is opened by the application of a force of 3.0 x 102 N directed perpendicular to the plane of the door at a distance of 0.80 m from the hinges. What is the torque?
120 N·m
240 N·m
300 N·m
360 N·m

Answer 1

For this question, we need  the formula τ = F x d, and just plug the numbers in.

Given the formula τ = F x d
Where τ = torque,
F = force applied, &
d = distance from the axis / hinge,

τ = 300 c 0.8 = 240Nm

Disregard the weight of the door or if there's any friction at the hinge. None of this will change the torque applied.