The opening near the bottom of the vessel has an area A.  A disc is held against the opening to keep the liquid from running out. Let F1  be the net force on the disc applied by liquid and air in this case. Now the disc is moved away from the opening a short distance. The liquid comes out and strikes the disc in elastically. Let F2  be the force exerted by the liquid in this condition. Then, F1/F2  is: