Which seismic waves are generally the last to arrive after an earthquake?
a. l waves
b. p waves
c. r waves
d. s waves

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

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.