Paper 4 May/June 2007 MATHEMATICH (9709/4) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

The diagram shows a ring of mass $2{\text{ }}kg$ threaded on a fixed rough vertical rod. A light string is attached 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 the two values of $T$ for which the ring is in limiting equilibrium.