# Just around the riverbend

**Classical Mechanics**Level 5

Consider a bend in a section of the river such that the outer bank follows a semi-circle of radius \(r\). Further suppose that the river is uniformly \(l\) wide from bank to bank. Finally, the water level rises a height \(h\) above its usual level, and the water flows uniformly at \(v\) m/s.

Find the minimum pressure (in Pa = N/m\(^2\)) the wall must be able to resist.

**Assumptions and Details**

- Hint: the bottom of the wall must be stronger than the top.
- \(R = 50\) m, \(h = 3\) m, \(v =5\) m/s, \(l = 15\) m
- The density of water is \(\rho_{H_2O} = 1000\) kg/m\(^3\)