Domestic aluminium foil for food use is 15 x 10^-6 m thickIn my local supermarket, a roll of foil measuring 10 m by 0.3 costs ?1.65.Calculate the cost per tonne of the foil as purchased in the supermarket.Account for any difference between this cost and the raw material cost of ? 1000 per tonne.the density of aluminium is 2700 kg m^3
In a nuclear weapon the mass is encased in lead so there is no radiation hazard.
A typical rool of foil has a mass given by the volume of aluminum times the desnity of aluminumThe roll has a volume: V 10 m x 0.3 m x 15 x10^-6 m 45 x 10^-6 m^2 The mass is M 2700 kg/m^-3 45 x 10^-6 m^3 0.1215 kg If there are 2000 kg/tonne then you need: N 2000 kg/0.1215 kg 16,461 rolls of foil and if each roll cost 1.65 pounds (sorry - no key for that), the total cost is C 16,4611.65 27,160 pounds Now there is a 26,160 pound price difference between raw material and the foilThe difference is due to the cost of smelting the raw material into aluminum metal, procesing the metal to make the foil (including rolling, cutting, etc), packaging, shipping, profit for the smelter, the metal processor, etc, supermarket costs (labor, overhead and so on), and store profit.
