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Mathematics 15 Online
OpenStudy (anonymous):

(a)The "lead" in pencils is a graphite composition with Young's modulus of about 1 x10^9 N/m^2. Calculate the change in length of the lead in an automatic pencil if you tap it straight into the pencil with a force of 4.0 N. The lead is 0.50 mm in diameter and 60 mm long.

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