Question

18. A lead pencil consists of a cylinder of wood with a solid cylinder of
graphite fitted into it. The diameter of the pencil is 7 mm, the diameter
of the graphite is 1 mm and the length of the pencil is 10 cm. Calculate
the weight of the whole pencil, if the specific gravity of the wood is
0.7g/cm and that of the graphite is 21 g/cm​

Answer 1

Answer:

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