Acar is traveling on the highway at 60 km/h. this is its
a. speed
b. velocity
c. acceleration
d. displacement

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 is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight