1. The problem statement, all variables and given/known data A 2.1 m long glass tube that is closed at one end is weighted and lowered to the bottom of a freshwater lake. When the tube is recovered, an indicator mark shows that water rose to within 0.43 m of the closed end. Determine the depth of the lake. Assume constant temperature. 2. Relevant equations Honestly...I have no idea how to approach this problem. The only relevant equations I know for this sort of problem are: (Pressure)=(density)(g)(height) and (height)=2(surface tension)/(density)(g)(radius) But neither of these equations seem to get me anywhere... 3. The attempt at a solution Like I said, I really don't have any idea how to approach this problem. The furthest I got was to calculate the total height of the water in the tube: 1.67m Using those equations I posted, I could calculate the radius of the tube or the initial pressure. But that information is irrelevant to the question. Any sort of information to help point me in the right direction would be greatly appreciated. Thanks in advance.