13 A uniform rod, \(A B\), has length 7 metres and mass 4 kilograms.
The rod rests on a single fixed pivot point, \(C\), where \(A C = 2\) metres.
A particle of weight \(W\) newtons is fixed at \(A\), as shown in the diagram.
\includegraphics[max width=\textwidth, alt={}, center]{27339c29-c4a1-480c-b882-930f8dacc7af-20_321_898_532_571}
The system is in equilibrium with the rod resting horizontally.
13
- Find \(W\), giving your answer in terms of \(g\).
[0pt]
[2 marks]
13 - Explain how you have used the fact that the rod is uniform in part (a).