An aluminium wire is wound on a piece of cork of mass 10 g. The densities ρc,ρa and ρwof cork, aluminium and water are 0.5×103 kg/m3, 2.7×103 kg/m3 and 1×103 kg/m3 respectively. The minimum mass of aluminium wire that should be wound on the cork so that the cork with the wire should stay completely submerged in water is: