Engineers are looking for a new material to build the body of an airplane. they agree that the material must be lightweight, but also strong and long-lasting. above all, the material must maximize the safety of the passengers. several engineers have developed some initial plans. which stage of technological design does this passage describe? identify a problem. design a solution. implement a solution. evaluate the solution.

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

What do you think car designers do if the damage caused by a crash test is too severe?

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.