Question

One end of a rope is tied to the handle of a horizontally-oriented and uniform door. a force f is applied to the other end of the rope as shown in the drawing. the door has a weight of 145 n and is hinged on the right. what is the maximum magnitude of f at which the door will remain at rest? hint: use the rotational equilibrium condition. include the weight of the door into the equation.

Answer 1

For rotational equilibrium of the door we can say that torque due to weight of the door must be counter balanced by the torque of external force

`F* L = mg * (L)/(2)`

here weight will act at mid point of door so its distance is half of the total distance where force is applied

here we know that

`mg = 145 N`

now we will have

`F = (mg)/(2)`

`F = (145)/(2) = 72.5 N`

so our applied force is 72.5 N