In the figure a 72 kg man walks out on a 14 kg beam that res

In the figure, a 72 kg man walks out on a 14 kg beam that rests on, but is not attached to, two supports.(Figure 1)

When the beam just starts to tip, what is the force exerted on the beam by the right support?

Express your answer to two significant figures and include the appropriate units.

Solution

The total mass is balanced by right support when it starts to tip.

F=mg

=(72+14)(9.8)
  = 842.8  N.