FYKOS Year 35 Series 5 Problem 3 — under the lid · FYKOS 35 #35.5.3
Physics · thermodynamics
Problem
A lid has a shape of a hollow cylinder of radius 6.00cm. The lid under which is an air of atmospheric pressure 1013hPa is placed in a horizontal washbasin. While doing the dishes, we start filling the washbasin with water at room temperature. The water also gets under the lid and compresses the air trapped inside. At a certain moment, the lid starts floating. At what height is the water level at that moment? The lid weighs 200g, its height is 2.00cm and negligible volume.