Hello, I would like somebody to help me with few simple questions for my homework. I did try to solve them but I failed at few of them. Here are the two papers I need to help with. I need help with the highlighted excerises. I tried some basic formulas for pressure and hyrdostatic pressure but as I said I failed a lot. May you guys please explain how can I achieve the result on these exercises. On the page with exercises 11) 12) and 13) Could you please explain i depth the 12 and 13? If you cant read the exercise just skip it. I would like to thank you in advance. 1. The problem statement, all variables and given/known data 2. Relevant equations Well I tried to work with P = H ⋅ ρ ⋅ g also I tried for the stone 13) V = (m ⋅ S) : ρ (of the stone) 3. The attempt at a solution I would like to apologise for not posting my attempts as it is just mess on my paper. I tried using these formulas but did not help. I was only given these. Cant really figure out much.