A man whose weight is 0.80kN is standing upright. How much his thighbone shortened compared to when he is lying down? The length of his thighbone when lying is 43.0 cm and the area of the thighbone is 8 cm. [Young's modulus of the thighbone Y $Y=9.4 \times 10^{9} \mathrm{~Pa}$ ]

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