Paper 5 May/June 2011 MATHEMATICS (9709/52) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

A uniform rod $AB$ has weight $15{\text{ }}N$ and length $1.2{\text{ }}m$. The end $A$ of the rod is in contact with a rough plane inclined at ${30^ \circ }$ to the horizontal, and the rod is perpendicular to the plane. The rod is held in equilibrium in this position by means of a horizontal force applied at $B$, acting in the vertical plane containing the rod (see diagram).
a) Show that the magnitude of the force applied at $B$ is $4.33{\text{ }}N$, correct to 3 significant…