A piece of highway maintenance equipment hooked to a trailer exerts a pulling force of 3.50 x 10^3N over a distance of 1.50 km. If the tractor's power output is 35.0 kW how long does it take to do the 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.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Which governments provide garbage collection services to homes and businesses