A roller coaster goes around one loop in 13.77 seconds. The loop has a radius of 16.234m. The coaster has a mass of 630kg. Find the velocity of the loop and then find the Fn of the roller coaster at the top of the loop.

In what direction does an applied force move an object

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.

How many electrons does each element require in its valence shell to become stable?