Optimistic people: A. see the glass as half full.
B. attribute their successes to their own abilities.
C. have a higher chance of becoming depressed.
D. attribute their success to outside influences.

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.

What does si stand for,when referring to a system of measurement

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87