A lead pencil consist of wood with a solid cylinder of graphite filled in the interior. The diameter of the pencil is 7mm and the diameter of the graphite is 1mm . If the length of the pencil is 14cm find the volume of the wood and that of the graphite.
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Answered by
1
Answer:
r - radius
volume of pencil = 22/7 * R²H
22/7* 14mm²*140mm (1cm=10mm)
=6160mm³
volume of graphite = 22/7 r² H
22/7 *1mm² *140mm
=440mm³
volume of wood =6160mm³ -440mm³
=5720mm³
Answered by
6
Step-by-step explanation:
r of ✏️=7mm
r of lead=1mm
h of ✏️ and lead =14cm=140mm
volume of ✏️=πr^2h
22/7*7*7*140
2156
volume of lead=22/7*1*1*140
440
volume of wood=2156-440
1716
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