Paper 4 May/June 2011 MATHEMATICS (9709/41) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

$ABC$ is a uniform triangular lamina of weight $19{\text{ N}}$, with $AB = 0.22{\text{ }}m$ and $AC = BC = 0.61{\text{ }}m$.
The plane of the lamina is vertical. $A$ rests on a rough horizontal surface, and $AB$ is vertical. The equilibrium of the lamina is maintained by a light elastic string of natural length $0.7{\text{ }}m$ which passes over a small smooth peg $P$ and is attached to $B$ and $C$. The portion of the string attached to $B$ is horizontal, and the portion…