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Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli
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(a) The “lead” in pencils is a graphite composition with a

Chapter 18, Problem 31PE

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QUESTION:

(a) The “lead” in pencils is a graphite composition with a Young’s modulus of 9? about 1×10? N / m2 . 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. (b) Is the answer reasonable? That is, does it seem to be consistent with what you have observed when using pencils?

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QUESTION:

(a) The “lead” in pencils is a graphite composition with a Young’s modulus of 9? about 1×10? N / m2 . 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. (b) Is the answer reasonable? That is, does it seem to be consistent with what you have observed when using pencils?

ANSWER:

Step-by-step solution 7 Step 1 of 5 (a) The radius of the graphite is half of the diametr The cross-sectional are of the graphite Step 3 of 5 When the pencil is compresed with 4N force

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