In the figure below, a horizontally-oriented beam is supported by a hinge at point A as well as a cable.  The beam length between points A and B is 20 meters, the distance (m) between the beam end and the cable attachment point is 16 meters.  The height (l) of the cable attachment above the hinge is 15 meters.  The weight attached at point B is 200 Newtons.  The beam is uniform density with a weight of 100 Newtons.  Beam weight can be assumed to apply at the beam mid-point.

In the figure below, a horizontally-oriented beam is supported by a hinge at point A as well as a cable.  The beam length between points A and B is 20 meters, the distance (m) between the beam end and the cable attachment point is 16 meters.  The height (l) of the cable attachment above the hinge is 15 meters.  The weight attached at point B is 200 Newtons.  The beam is uniform density with a weight of 100 Newtons.  Beam weight can be assumed to apply at the beam mid-point.

How many equations of equilibrium are available?