Andrea walked 1 block north and then 2 blocks west. how would you determine her total displacement?

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging

Can someone answer my last question i posted? on my last post? my hw is due tomorrow and i’m confused.