Q. 184.8( 6 Votes )

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Answer :

Given,

Diameter of pencil = 7 mm

Radius of pencil =

Diameter of graphite = 1 mm

Radius of graphite =

Volume of graphite = πr²h =

Weight of graphite = volume × specific gravity of graphite

Volume of wood = volume of pencil – volume of graphite

∴ Total weight of the pencil = weight of wood + weight of graphite

= 0.165 + 2.64 = 2.805 g.

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