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Q2. A steel rod is 280mm long with a diameter of 28mm. It is firmly attached at one end to a copper rod of length 580mm. When the combined assembly is subjected to a tensile pull of 40kN, the extensions of the steel and copper portions are found to be equal. Calculate EACH of the following:

(a) the diameter of the copper rod;

(b) the stress in each rod;

(c) the total extension;

(d) the work done in straining the assembly.

Note: Modulus of Elasticity for Steel = 210 GN/m²

Modulus of Elasticity for Copper = 90 GN/m²