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18. A lead pencil consists of a cylinder of wood with a solid cylinder ofgraphite fitted into it. The diameter of the pencil is 7 mm, the diameterof the graphite is 1 mm and the length of the pencil is 10 cm. Calculatethe weight of the whole pencil, if the specific gravity of the wood is0.7g/cm2 and that of the graphite is 2.1 g/em2

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