The following problems are to be solved using the principle of virtual work.ProblemThe sys...

The following problems are to be solved using the principle of virtual work.

Problem

The system is in equilibrium.

(a) By drawing free-body diagrams and using equilibrium equations, determine the couple M.

---

(b) Using the result of (a) and the principle of virtual work, determine the angle through which pulley B rotates if pulley A rotates through an angle α.