determine the hydro static forces acting on a spherical cap of a tank containg ethanol: problem occurs when calculating FNx $=$ F$2,$ where F$2$ can be found by $($specific gravity$)($distance from the top of liquid level to the centre of mass$)($Area on which F$2$ acts on$),$ how to determin the area or is there another method to find F$2?$ then foe would i calulate FNy$?$