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+\documentclass[final]{exam-n}
+\begin{document}
+
+\begin{question}{30} \comment{by John Brown}
+Give the equations of motion for $i=1,\ldots, N$  particles of
+masses $m_i$ and positions  $r_i(t)$ under the action of mutual
+gravity alone in an arbitrary inertial frame.
+\partmarks{4}
+
+Use these to derive the following conservation laws of the system:
+
+\part Constancy of linear momentum -- i.e., centre of mass fixed in a
+suitable inertial frame. \partmarks{4}
+ \part Constancy of angular momentum. \partmarks{6}
+ \part Constancy of total energy.  \partmarks{8}
+
+How many integrals of motion exist in total?
+\partmarks{2}
+
+Derive the moment of inertia   of the system and demonstrate its
+relevance to criteria for escape of particles from the system.
+\partmarks{6}
+\end{question}
+\end{document}