A uniform metre scale can be balanced at the 70.0 cm mark when a mass of 0.05 kg is hung from the 94.0 cm mark. Find the mass of the metre scale.
A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end.
(a) Draw a diagram of the arrangement.
(b) Find the mass of the half metre rule.