A light inextensible string, which passes over a fixed smooth peg A, is
fastened at one end to a small ring R of mass 0.1kg and at the other end to a
particle P of mass 0.3kg. The ring is threaded on a fixed rough vertical wire
and the system rests in equilibrium with the part AR of the string inclined at
an angle of 60 degrees to the vertical and the part AP of the string vertical
as shown in the diagram.Draw a clear diagram showing all forces acting on the particle and on the ring and state the tension in the string.Given that the equilibrium is limiting

Question

A light inextensible string, which passes over a fixed smooth peg A, is 
fastened at one end to a small ring R of mass 0.1kg and at the other end to a 
particle P of mass 0.3kg. The ring is threaded on a fixed rough vertical wire 
and the system rests in equilibrium with the part AR of the string inclined at 
an angle of 60 degrees to the vertical and the part AP of the string vertical 
as shown in the diagram.Draw a clear diagram showing all forces acting on the particle and on the ring and state the tension in the string.Given that the equilibrium is limiting

abmon98 · Answer

explain why the ring is on the point of moving upwards and calculate the coefficient of friction between the ring and 
the wire.Find the magnitude of the resultant force exerted on the peg by the string.