If an axial force N is applied gradually to a bar which is linear elas – McqOptions

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1.	If an axial force N is applied gradually to a bar which is linear elastic and has a constant cross sectional area A and length L, what will be the value of U_i ?
A.	<sup>1</sup> <sub>4</sub> N<sup>2</sup>L/AE
B.	<sup>1</sup> <sub>3</sub> N<sup>2</sup>L/AE
C.	<sup>1</sup> <sub>2</sub> N<sup>2</sup>L/AE
D.	N<sup>2</sup>L/AE
Answer» D. N<sup>2</sup>L/AE

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