I'm writing the third in a series of Young Adult Sci-Fi/Fantasy novels, and I'm trying to calculate how much force would be required in the following: Imagine a pipe that is 1.25 centimeters in diameter and 3000 meters long. The pipe lies perfectly flat, but a meter of the pipe at each end is turned upward at a 90 degree angle. Now, the pipe is filled completely with water so that the water is level with the tops of the upturned ends. My question is, how much force would it take to drive a plunger down into one end and force half a meter of water out of the other? Is the mass of the water in the 3000 meter pipe taken into consideration? Or is only the mass of the water in the upturned ends considered? Could this be done by hand? Thank you for any help you can give! This problem just contains more physics than I'm familiar with.