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A small ring of mass 0.6 kg is threaded on a rough rod which is fixed vertically. The ring is in equilibrium, acted on by a force of magnitude 5 N pulling upwards at \(30 ^ { \circ }\) to the vertical (see diagram).
- Show that the frictional force acting on the ring has magnitude 1.67 N , correct to 3 significant figures.
- The ring is on the point of sliding down the rod. Find the coefficient of friction between the ring and the rod.