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the direct tensile force in the member is 0.12in/mm2 and its area of cross section is 200mm2. if the extension producedis 0.0012mm, what is the strain energy s in n-mm

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the direct tensile force in the member is 0.12in/mm2 and its area of cross section is 200mm2. if the extension producedis 0.0012mm, what is the strain energy s in n-mm
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