A bar of length (L) and Young's modulus (E) is subjected to an axial force. Compare the
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A bar of length \(L\) and Young's modulus \(E\) is subjected to an axial force. Compare the spring constants of bars with cross sections in the form of a solid circle (of diameter \(d\) ), square (of side \(d\) ), and hollow circle (of mean diameter \(d\) and wall thickness \(t=0.1 d\) ). Determine which of these cross sections leads to an economical design for a specified value of axial stiffness of the bar.
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