A sedimentary rock is formed from mud, sand, and pebbles that are deposited in layers upon layers that eventually turn to rock. How is the composition of a rock different from that of cells in living organisms?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Which atomic model was proposed as a result of j. j. thomson’s work?

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.