What centripetal force is required to keep the moon in orbit around the Earth? What is the magnitude of the force? The Earth has a mass of 6 E 24 kg and the distance is 4 E 8 meters. Use Fg = (Gm1m2)/d2.

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.