A 300 mm long sample with a square cross-section (side length 10 mm) is stretched until the side length is decreased by 0.002 mm. What is the applied force?  E=80GPa and v=0.33. Assume the deformation is elastic.

Which of the following statement(s) below is false? Select all that apply.

A three-point bending test is performed on a cylindrical specimen (radius = 9.1 mm); the distance between support points is 45 mm. Compute the flexural strength if the load at fracture is 5560 N.

Two impurity atoms of different elements are added to a metallic element. Which is the more likely scenario?

Calculate the diffusion coefficient for copper in aluminum at 600oC.

Calculate the number of Frenkel defects per cubic meter in zinc oxide at 727˚C. The energy for defect formation is 2.51 eV, while the density for ZnO is 5.55 g/cm3 at this temperature. 

Calculate the diffusion coefficient (in m2/s) for copper in aluminum at 300 oC.

Which of these is considered a planar defect?

Calculate the diffusion coefficient (in m2/s) for copper in aluminum at 400 oC.

A molten polymer is quenched (rapidly cooled), arresting the structure of the liquid in the solid polymer state. True or false: This method of processing (quenching) is a good way to make a gas barrier film.