5. Based on the base $AC$ of the isosceles triangle $ABC$, a circle is constructed with $AC$ as its diameter, intersecting the side $BC$ at point $N$ such that $BN: NC = 5: 2$. Find the ratio of the lengths of the medians $NO$ and $BO$ of triangles $ANC$ and $ABC$.
Answer: $\frac{N O}{B O}=\frac{1}{\sqrt{6}}$.