Calculate the resultant, at point O, of the applied force (ignore the weight of the beam).
Solution with FisicaLab
Select the group Static and, inside this, the module Static of solids. Erase the content of the chalkboard and select the English system. And add one element Stationary reference system, one element Beam, two elements of beam, one element Force and one element Resultant with vertical force, as show the image below:
The element Stationary reference system set, to default, the gravity value:
To the element Beam, we call this Beam, we have:
Here we have 0 to the mass, because we must ignore the weight of the beam. To the element of beam that represent the lower side, we have:
And to the element Resultant applied here:
To the other element of beam, we have:
27 @ in
And to the applied force:
Now click in the icon Solve to get the answer:
Mr = -109.696 lb*ft ; Fr = -85.000 lb ; Status = success.