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: D(t) =

2-exp(-0.1t), 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 in length of the rod. Express the

result in mm, with two decimals.

B) After 10 hours, the 10 kg mass is removed.

Calculate the strain remaining in the rod after a

further 10 hours. Express the result in percentage,

with three decimals