a lead pencil consists of a cylinder of wood with a confectioners of graphite filled into it.the diameter of the pencil is 7mm,the diameter of the graphite is 1mm and the length of the pencil is 10cm.calculate the weight of the whole pencil,if the specific gravity of the wood os 0.7gm/cmcube and that of the graphitebisn2.1gm/cmcube..
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