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Some Mechanical Properties of Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSome Mechanical Properties of Matter2 Marks
Question
The yield point of a typical solid is about 1%. Suppose you are lying horizontally and two persons are pulling your hands and two person are pulling your legs along your own length. How much will be the increase in your length if the strain is 1%? Do you think your yield point is 1% or, much less than that?
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Answer

Let my length = L Let the increase in length = l Strain$=\frac{\text{l}}{\text{L}}=\frac{1}{100}$
$\Rightarrow\text{l}=\frac{\text{L}}{100}$
So, the increase in length will be $\frac{\text{L}}{100}.$ Yes, the yield point is much less than the 1% strain because the human body consists of joints and not one uniform solid structure.

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