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12.3 Exercise 14

Avg difficulty 2.5

The “lead” in pencils is a graphite composition with a Young’s modulus of approximately 1.0×109N/m2.1.0 \times 10^{9} \text{N} / \text{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.

OpenStax University Physics Volume 1, 12.3 Stress, Strain, and Elastic Modulus, exercise 14

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Adapted from University Physics Volume 1 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 1. Imported at revision db44eb9.