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SOLVED:The shear modulus of polyvinyl chloride (PVC) is observed to relax from a glassy value of Gg=800 MPa to a rubbery value of Gr=1.67 MPa. The relaxation time at 75^∘ C is approximately τ=100  s, although the transition is much broader than would be predicted by a single relaxation time model. But assuming a standard linear solid model as an approximation, the shear operator is The bulk modulus is constant to a good approximation at Ke=1.33 GPa. These data can be used to predict the time dep

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