A lead pencil consists of a cylinder 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 1 mm.If the length of the pencil is 14 cm ,find the volume of the good and that of the graphics.

 

Asked by Ishanpincha162003 | 12th Feb, 2019, 09:38: PM

Expert Answer:

volume space of space inner space cylinder space equals space volume space of space graphite
equals πr squared straight h
equals 22 over 7 cross times open parentheses 0.5 close parentheses squared cross times 140 equals 110 space cu. mm
volume space of space pencil space equals space equals 22 over 7 cross times open parentheses 3.5 close parentheses squared cross times 140 equals 5 comma 390 space cu. mm
volume space of space wood space equals space volume space of space pencil space minus space volume space of space graphite space equals space 5280 space cu. mm

Answered by Arun | 13th Feb, 2019, 09:33: AM