A bullet is fired perpendicularly into a plate at an initial speed of 200 m/sec. When the bullet exits the plate, its speed is 50 m/sec. It is known that the thickness of the plate is 20 cm and the resistant force of the plate on the bullet is proportional to the square of the speed of the bullet. Determine the time that the bullet takes to pass through the plate.

What is work? how much work is done to move an object 0 meters?

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.

How is an electron dot structure used to represent a covalent bond?