Quelle est la composition de chacun de ces atomes d'oxygène? Justifie ta réponse en expliquant tes calculs

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

What is the final velocity of the initial velocity of 25 and -50?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.