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Before heading out on her big date, Ling stands in front of the bathroom mirror brushing her 0.25-m-long hair with a force of 2.0 N.

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Before heading out on her big date, Ling stands in front of the bathroom mirror brushing her 0.25-m-long hair with a force of 2.0 N. If the cross- sectional area of a piece of hair is 1.0 x 10-7 m2, by how much does the hair stretch when it is brushed? (Yhair = 2.0 x 109 N)

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