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A. From a wire of length I0 and a cross-section of area A depends weight body W. (a) Show that if the wire obeys the Hooke Law, it behaves as a "spring" of constant AY/I0, where Y is the measure of Young (measure elasticity) of the material from which the wire is composed. (b) What is the value of the "spring" for copper wire (Y = 11*1010 Pa) of 75.0cm long and 1.291mm in cross-section. (c) What should be the body weight W dependent on the wire of the previous query so that this wire extends by 1.25mm.

B. A titanium alloy cylindrical specimen with a modulus of 107 GPa and an initial diameter of 3.8 mm is only elastically deformed when a vertical tensile load of 2000 N is applied. If the maximum permissible deformation is 0.42 mm, calculate the maximum length of the specimen before the deformation begins.

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