Lecturing on a beam A 70-kg professor sits on a 20-kg beam while lecturing (Figure P...

Lecturing on a beam A 70-kg professor sits on a 20-kg beam while lecturing (Figure P7.66). A rope attached to the end of the beam passes over a pulley and down to a harness that wraps around the professor (the professor is supported partly by the beam and partly by the harness). The professor sits in the middle of the beam. Determine the force that the rope exerts on the harness and professor and the force that the beam exerts on the professor.