This is an extension of the online assignment item 4. a 5 m long pipe with a radius of 0.25 m is open at one end and closed at the other is oriented with the open end facing down over a body of water. the pipe is slowly pushed straight down into the water until the top of the pipe is level with the surface of the water. explain any assumptions or approximations that you will make for this problem. explain what type of process this is. make sure to include what is staying constant and the reason that it is staying constant. calculate the length (l) of the air column in the tube after being submerged. calculate the work done on the gas in the pipe.