Paper 4 October/November 2001 MATHEMATICH (8709/4) IGCSE
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

Two rectangular boxes $A$ and $B$ are of identical size. The boxes are at rest on a rough horizontal floor with $A$ on top of $B$. Box $A$ has mass $200{\text{ }}kg$ and box $B$ has mass $250{\text{ }}kg$. A horizontal force of magnitude $P{\text{ }}N$ is applied to $B$ (see diagram). The boxes remain at rest if $P \leqslant 3150$ and start to move if $P \gt 3150$.
a) Find the coefficient of friction between $B$ and the floor.
The coefficient of friction…