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the two values of $T$ at which the ring is in limiting equilibrium.
Mathematics 9709 · AS & A Level · Forces and equilibrium
Forces and equilibrium — practice question
The diagram depicts a ring of mass $2\,\text{kg}$ threaded onto a fixed rough vertical rod. A light string is fastened to the ring and is pulled upwards at an angle of $30^\circ$ to the horizontal. The tension in the string is $T\,\text{N}$. The coefficient of friction between the ring and the rod is $0.24$. Find