9709 P43 - Nov 2015 - Q2
4084
A ring of mass 0.2 kg is threaded on a fixed rough horizontal rod and a light inextensible string is attached to the ring at an angle \(\alpha\) above the horizontal, where \(\cos \alpha = 0.96\). The ring is in limiting equilibrium with the tension in the string \(T\) N (see diagram). Given that the coefficient of friction between the ring and the rod is 0.25, find the value of \(T\).
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