A 30 kg boy sitting on a 10 kg go-kart wants to travel down a hill of height 10 m, starting from rest. a. What is the initial potential energy of the boy and go-kart together?
b. What is their initial kinetic energy?

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.