Uniform rod AB with end B resting against rough vertical wall. Coefficient of friction between wall and rod is μ.
Rod is 2m long and has mass 3kg.
Rod is kept in limiting equilibrium by a light inextensible string, one end of which is attached to the end A of the rod and the other to point C on the wall 2m above B. Angle ABC=120°.
The end B of the rod is about to slip down the wall.
1. By taking moments about C, show that the normal reaction at B is approx. 12.7N.
2. Find the value of μ.
PS: A labelled diagram would be very helpful! Thanks!
2. Relevant equations
3. The attempt at a solution
Have been able to sketch what I think are all the forces acting on the rod, but does the normal reaction + friction + T-resolved = downward force of 2g-resolved? Do I take the weight of the rod to act from the centre?