Arigid tank is divided into two equal parts by a partition. one part of the tank contains 4 kg of compressed liquid water at 200 kpa and 80ºc and the other side is evacuated. now the partition is removed, and the water expands to fill the entire tank. if the final pressure in the tank is 40 kpa, determine the heat transferred out of the tank. determine the exergy destroyed during this process. assume the surroundings to be 25ºc and 100 kpa.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?