14 A metal rod, of mass \(m\) kilograms and length 20 cm , lies at rest on a horizontal shelf. end of the rod, \(B\), extends 6 cm beyond the edge of the shelf, \(A\), as shown in the The end of the rod, \(B\), extends 6 cm beyond the edge of the shelf, \(A\), as shown in the diagram below.
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14
- The rod is in equilibrium when an object of mass 0.28 kilograms hangs from the midpoint of \(A B\).
Show that \(m = 0.21\)
14
- The object of mass 0.28 kilograms is removed.
A number, \(n\), of identical objects, each of mass 0.048 kg , are hung from the rod all at a distance of 1 cm from \(B\).
Find the maximum value of \(n\) such that the rod remains horizontal.
14 - State one assumption you have made about the rod.