3pts] A9. The following equation is derived from Fick\'s 2nd law for specific bo

Question

3pts] A9. The following equation is derived from Fick's 2nd law for specific boundary conditions. Which of the following boundary conditions is not valid? C -Co Cs-Co [a] At t> 0, the initial concentration (Co) is constant for OsxSo [b] At t>O, the surface concentration (Cs) is held constant at x 0 [c] At t = 0, the initial concentration (Co) is constant for 0 x 00 In comparing material A and material B via the table below, which is more ductile? A10. Material A MaterialB E (GPa) 140 100 oy (MPa) 120 120 Et 0.001 0.1 (a) [b] (c) [d] Material A Material B Both materials are equally ductile Not enough information

Explanation / Answer

A 9) OPTION A IS NOT VALID remaining b and c are the boundary condition of ficks second law.

A 10) answer is Option B. Material B is more ductile because it has more fracture strain which is dependent on the final length. if final length more the ductility will be more.  

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