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The elastic modulus, yield strength and ultimate strength of a certain material are 110 GPa, 240...

The elastic modulus, yield strength and ultimate strength of a certain material
are 110 GPa, 240 MPa and 265 MPa, respectively. If a cylindrical bar of this
material 380 mm long is subjected to a uniaxial tension test and its length is
increased by an amount of 0.50 mm under a tensile load of 6660 N. At the same
time its diameter decreased by 0.28 mm. Calculate;
a) The initial diameter of the bar,

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