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A straight rod of solid polymer is of length 1 m and diameter 10 mm. The polymer is linearly viscoelastic with a tensile creep compliance given by:
D = 2- exp(-0.1t); Gpa^-1
Where t is in hours. The rod is suspended vertically and a mass of 10 kg is hung from it for 10 hours. a) Find the change of length of the rod. b) Identify the time domain of this property test procedure.