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 crosssectional area of a piece of hair is 1.0 107 m2, by how much does the hair stretch when it is brushed? (Yhair 2.0 109 N)

Extension in the length of the hair is given as

Explanation:

As we know by the formula of elasticity that the ratio of stress and strain is known as modulus of elasticity

So we will have

Now we have

So we have

so we have

So we have

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