Paper 5 May/June 2011 MATHEMATICS (9709/51) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

A small block of mass $1.25{\text{ }}kg$ is on a horizontal surface. Three horizontal forces, with magnitudes and directions as shown in the diagram, are applied to the block. The angle $\theta $ is such that $\cos \theta = 0.28$ and $\sin \theta = 0.96$. A horizontal frictional force also acts on the block, and the block is in equilibrium.
a) Show that the magnitude of the frictional force is $7.5{\text{ }}N$ and state the direction of this force.
b)…