Which information about the earth would be represented when a globe is used as a model?
choose all answers that are correct.(more than one)
a.
the speed of revolution around the sun
b.
the location of the axis and poles
c.
the brightness of the sun on the earth
d.
the location of the earth's oceans

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.