From smallest to largest, what is the correct order of these astronomical distance units? a) parsec, light-year, au b) light-year, au, parsec c) au, light-year, parsec d) au, parsec, light-year

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?